We visited Epic and the other universal parks during our stay at SSR last week.
With hindsight, I should have booked a universal hotel for a night to get the express passes for IOA and studios. We really wanted to ride Hagrids, but without express, the lines were just too long for me and various kids who are too little to ride.
We purchased express passes for Epic. Be prepared - it does not work the same as the other parks (yet). Only gives you a ‘shorter’ wait than standby, which, in some cases was still 100 mins (looking at you Mario Kart!).
The day we visited (21st), the express passes for Epic did not include mine cart or battle at the ministry. Of course, this was changed on 22nd to include both!