The Giants aren’t going to be good this season. They’re going to be great. At least according to one NFL insider. ESPN’s Peter Schrager joined The Post’s Adam Schein for Wednesday’s “Schein Time” to discuss Big Blue’s chances for 2026. Not only does Schrager believe the Giants are going to have a winning record, but they could attain double-digit victories for the first time in 10 years. Schrager thinks the Giants have the consummate professional in John Harbaugh. And, on top of that, the new head coach’s offensive staff is going to be a boon to the entire unit. “I think this might be an 11 or 12-win team,” Schrager said. “I really do. … They have a very good roster. And early returns on the Harbaugh, which, by the way, I was a little bit ‘OK, let’s see how this all plays out’ based on the hiring process. And he’s coming, wait, we gotta wait, and what’s going on with [general manager Joe] Schoen and that.…