if it's anything like Shanghai Disney, they will have some sort of a soft opening period of several weeks where only select people who can get tickets can visit while they iron out their wrinkles. The covid situation might actually work in their favor so they're not in a rush to ramp up attendance.

In the Disney case, the soft opening tickets weren't actually that hard to get if you asked around for people with connections, since even that numbered in the tens of thousands each day. Disney officially opened in June 2016, while the soft opening started around April I think. Assuming the May date for Universal is not pushed back, I would expect the soft opening schedule to be around the same as well.