Odell Beckham Jr. has made good on his promise not to hold out.

And now it is time for the Giants to start the clock on serious contract negotiations that will lead to a $90 million-$100 million deal.

Peace is at hand.

John Mara announced Thursday that negotiations would begin “sooner rather than later.”

In Mara’s view, Beckham has gotten the message.

“We obviously want him to be a Giant for a long time,” Mara said.

The Giants will be making him the highest-paid receiver in football.

“I think this is the time we always had in mind,” Mara said. “I think Odell personally is moving in the right direction. He showed up yesterday with a smile on his face and worked hard. I think he’s ready to have a great season, and we’re ready for him to have a great season.”

The model for Beckham and the Giants played itself out in the summer of 1990, when Lawrence Taylor ended his 45-day holdout days before the start of the season opener and became the highest-paid defensive player in the NFL.

“Nobody gets exactly what they wanted,” Taylor said at the time. “It’s not like that. I’d look kind of stupid bitching at the money I will be making because it is good money.”

It was for $1.6 million, a mere pittance compared to the $18 million-$20 million or so average that would make Beckham the highest-paid receiver in the NFL. There was no $177.2 million salary cap back in those days, of course.

LT, with two Super Bowl rings and all those sacks, had accomplished far more than Beckham has to date. But he was 31 at the time. Beckham is 25.

Mara previously had said a contract extension will get done when it gets done.

Get it done in time for the regular season opener against the Jaguars.

Both sides should operate under the good-faith understanding that an agreement will be reached by Sept. 9.

And it sure seems likely now that they are.

Beckham does not have to play in the preseason games, nor should he, given what happened to him a year ago in Cleveland. He can work tirelessly at practice getting his timing down with Eli Manning.

Pat Shurmur has developed a relationship with Beckham that Tom Coughlin and Ben McAdoo did not have. Ownership and management owe Shurmur the best possible chance to be successful in his second head-coaching opportunity, owe Manning the best possible chance to chase that elusive third Super Bowl championship with the window closing quickly, and a healthy, motivated, all-in Beckham who burns to be legendary gives them their best possible chance — on a pick-your-poison offense revolving around Beckham and Saquon Barkley.

And it gives Giants fans their best possible chance to vaporize the stench of 3-13.

The tricky part is how Shurmur and Beckham can negotiate the summer practices knowing that Beckham will be understandably hesitant to jeopardize his rehabbed ankle fracture in the absence of an extension. Shurmur, long on common sense, has indicated he will be smart with Beckham. “I just want him to be ready for Jacksonville,” Mara said.

Beckham has driven Mara to distraction too many times with his indiscretions on the field and off. Maybe Beckham has finally grown up and gotten the message Mara delivered in March that no one is untouchable. Scared straight.

Or maybe Beckham is simply wise enough to toe the line with so many dollars at stake.

Or maybe it means he wants to be A Giant For Life because he would get his money anyway from someone.

The $15 million lawsuit filed against Beckham? “We’re certainly aware of it, but it’s not something that we’re focused on,” Mara said.

The Giants, owning the leverage at the moment, could go the Kirk Cousins franchise tag route on Beckham, but that could prove costly by alienating their star player at a time when the other members of the Wide Receiver Class of 2014 have already hit the jackpot:

Mike Evans, five years, $82.5 million, $55 million guaranteed.

Sammy Watkins, three years, $48 million, $30 million guaranteed.

Jarvis Landry, five years, $75.5 million, $47 million guaranteed.

Mara’s dream:

A peaceful summer.

A hometown discount from the Beckham camp.

Beckham’s dream:

A deal by Sept. 9.

The ball is in Big Blue’s court.

Time to start the clock.

He is the Giants’ offensive Lawrence Taylor.

Time to make him Doughdell Beckham Jr.

No. 13 waved to the fans, who chanted “OBJ,” he danced to “Beat It,” caught several short slants, showing burst on one as he exploded to daylight, but nothing vertical as he was eased back on his field of dreams, finally, with his teammates.

A good day to be Odell Beckham Jr.

Many more to come. In blue.