Do we though? We know that Archer encountered a Universe-class starship named the USS Enterprise NCC-1701-J when transported to his relative future to the 26th Century, but we don't know that the 26th Century he encountered is the Prime Timeline's 26th Century. It's just as possible that the events of the 2500s may play out differently.
In fact, given that we're already at the Enterprise-G in 2402, that leaves us with only the Enterprise-H and Enterprise-I to fill up the interm roughly 100-150 years until the future Archer saw. I think there's a decent chance that the Universe class and/or the Enterprise-J don't happen in the Prime Timeline, at least not the versions Archer saw.