The Giants have won only one of their last 11 regular season openers.

They haven’t won a Week 1 game since 2016 in Dallas under rookie head coach Ben McAdoo.

There is nowhere to go but up for Brian Daboll in his head coaching debut Sunday afternoon at Nissan Stadium against the Tennessee Titans. But this is Year 1 of (another) long-term rebuild plan.

So the question for Sunday is this: Will Daboll’s Giants look competent, competitive and entertaining against the AFC’s reigning No. 1 seed from last season?

Or will the honeymoon phase in East Rutherford disappear in a snap, replaced by the harsh reality of how far away the Giants remain from NFL relevance?

Win or lose, that is what co-owner John Mara consistently has said he’s looking for: a demonstration of progress.

Of course, timelines change when impatience and restlessness kick in, a product of the snowball effect of poor management decisions, frequent losing and irrelevance.

Mara uncharacteristically kept quiet this training camp, letting new GM Joe Schoen and Daboll take the stage and do the talking. Steve Tisch has receded from public view.

We haven’t heard from Mara on the record since March at the Florida owners’ meetings when he said things like: “Our offensive line should be better, God willing.”

Schoen said on Sept. 1 that Mara “understands what we’re trying to do,” when asked if ownership has patience for a painful 2022 season with the long-term in mind.

The best thing for the Giants’ organization long-term would be to lose a lot this season and get a high draft pick, presumably for Schoen to select Daniel Jones’ successor at quarterback.

Cutting a quality player like inside linebacker Blake Martinez recently could have been viewed as a reminder that the Giants may be willing to endure short-term pain for long-term gain.

At the same time, we know Mara is fed-up with losing. He pulled the plug on a minimum three-year rebuild under Joe Judge after two seasons.

He is on the record in November 2017 slamming the door shut on any suggestion that his team would lose in order to maximize its draft position.

“I read something somewhere about, are we going to tank the rest of the season? That’s complete bulls—t.” Mara said then. “I would never allow that here. We’re going to try to win the games.”

Mara also is on the record saying he wants to do right by Jones. And Schoen’s draft selections of tackle Evan Neal and wideout Wan’Dale Robinson in the first two rounds added key pieces to hopefully augment Jones’ supporting cast immediately.

“We’ve done everything possible to screw this kid up since he’s been here,” Mara said in January. “We keep changing coaches, keep changing offensive coordinators, keep changing offensive line coaches. I take a lot of responsibility for that, but let’s bring in the right group of coaches now and give him some continuity and try to rebuild the offensive line and then be able to make an intelligent evaluation of whether he can be the franchise quarterback or not.”

The question is whether it’s enough, whether Daboll and offensive coordinator Mike Kafka can conceal the Giants’ lingering personnel deficiencies with their scheme and a bit more speed.

Defensive coordinator Don “Wink” Martindale’s blitz-heavy attack could be an X-factor that ignites some life into the program.

However, the Giants’ secondary is a major question mark. There are players all over the starting 11 on defense who would be backups on most other teams.

And edges Kayvon Thibodeaux and Azeez Ojulari are both doubtful to play due to ailments sustained in an injury-filled training camp and preseason.

The schedule is favorable, with seemingly winnable games on the schedule against teams such as the Chicago Bears, Jacksonville Jaguars, Seattle Seahawks, Houston Texans and Detroit Lions.

But Schoen wouldn’t even set expectations for his team in his Sept. 1 press conference. That’s how grim this could be.

“We’re still trying to put the pieces together,” he said. “So I don’t want to set any expectations.”

All the talk about how hamstrung this new regime is by the previous regime’s mistakes, however, needs to quiet down starting on Sunday.

Schoen was telling the truth when he said their salary cap challenges are “the hand we were dealt, and we’re going to do the best we can with what we have.”

But Schoen and Daboll have been running this team for seven months now. And the organization did not turn over its salary cap management department or its medical department in January’s staff purge, despite all of the blame on their money problems and past injuries.

So this new program in place is theirs.

“We’re going to continue to try to compete and do the best we can,” Schoen said.

Jones’ fate as the franchise’s quarterback, then, becomes one of the benchmarks to follow on how the season is faring, where the Giants are focused, and what their plans are for the future.

“I think Daniel’s in a good place,” Schoen said on Sept. 1. “I’m happy where he is. But we all know everybody’s got to perform on Sundays. That’s when the evaluation will really start.”

It also starts Sunday for Schoen, Daboll and — again — Mara and Tisch.

ROSTER MOVES

The Arizona Cardinals signed offensive guard/center Max Garcia off the Giants’ practice squad to their active roster. He is the second lineman poached from their practice squad this week. The Saints also signed Wyatt Davis to their active roster. … The Giants, meanwhile, activated edge Quincy Roche & safety Tony Jefferson for Sunday’s game at the Titans.

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