If IOA has early entry then I'm sure it would likely include Hagrids, it's just that IOA hasn't had early entry at all yet since Hagrid's opened. And looking at the park calendar on the app (which seems to be more up to date than the main site) IOA isn't getting early entry that I can see for the rest of the year (It's showing USF as having early entry each month, but that maybe could change).
As for express pass, Escape from Gringotts took 3 years to get express pass (not months). Ride opened in July 2014 and all of the main Potter attractions (FJ, Gringotts and Hogwarts Express) didn't get express pass until July of 2017.
Kong got express pass a few months after open and the hopes were that Hagrid's might follow a similar time frame, but I wouldn't hold my breath. Ride is still not at 100% operations (they stop letting people in line around 5:00 pm so they can close the ride by 7:00 to do nightly maintenance). So I doubt they're even contemplating opening up Express Pass until the ride is 100% operational (i.e. it can go the full day park open to park close without any issues).
So no one really knows when they'll add express pass for it, but I would guess it isn't coming anytime soon. Maybe we'll be lucky and they'll have it added by the end of the year.
