Are you going on Labor Day, which would be the Monday? If so, I would anticipate heavy crowds. The Tuesday after Labor Day wasn’t bad at all in 2021.
Also, I forgot to mention that all of Universal’s hotels offer early entry, which would be for USF during HHN season. Only Hard Rock, Portofino Bay, and Royal Pacific have the complimentary express. If you don’t think you need express, Cabana Bay offers the best onsite experience and value IMO.