Inside how the Giants landed John Harbaugh — and what’s next for franchise

The Giants’ agreement with John Harbaugh to become their next head coach was inside the 1-yard line and up to the lawyers to run a successful Tush Push.

A fan base itching to celebrate still was awaiting an official announcement as of late Thursday night after The Post’s Paul Schwartz was first to report late Wednesday night that a deal was imminent.

Once the legalese is rubber-stamped, that franchise-changing contract is expected to come in around $100 million over five years, which would put the Super Bowl-winning Harbaugh in the conversation for highest-paid NFL coach and make his annual salary more than three times what the Giants are accustomed to paying.

Harbaugh, 63, canceled a meeting at his Baltimore-area home with Titans’ brass scheduled for Thursday morning and withdrew from the Falcons’ search — he previously had an exploratory phone conversation with new team president Matt Ryan — after his all-day Wednesday visit to the Giants answered all questions.

The only tweet from the Giants’ official account Thursday was a smirking face emoji as league circles buzzed with the news.

The Giants’ full-court press included an interview with co-owners John Mara and Steve Tisch and high-ranking executives, a tour of the building, a one-on-one meeting with rookie quarterback Jaxson Dart and a lavish dinner at Elia Mediterranean capped by a celebratory bottle of a rare Silver Oak wine.