June 1 looks similar to opening day, but that could change as we get closer.
Most of us are using this page as reference for these numbers:
Universal Epic Universe Daily Capacity | Thrill Data
It is worth keeping in mind that the total capacity cap may vary from what is listed, hence the "at least" verbage used for that column on the table. Also, with the way multi-tickets are counted, a 14k max cap day may see only 10k guests, depending on who shows up (which is my guess on partially what happened grand opening day to have even less crowds than a preview day). Universal is keeping their promise to allow enough capacity to let in EVERYONE with a multi-day ticket that covers that date, no matter what.