The MK morning routine is no different on an Early Morning Magic morning than any 9am opening day.
EMM and PPO ADR guests are let in approximately 7:45am.
Regular park guests will be let in sometime approx 7:45am-8am. I have seen both sets of folks let in at the same time and I’ve seen regular park guests held just a touch.
Regular park guests are free to roam Main Street up to the castle. Many shops are open, Starbucks is open. Often Main Street vehicles are running so it can be a good time to ride one with minimal wait.
The opening show at the castle will be approx 8:55am, after which they “drop the ropes” at the various castle hub spokes and the park is open. A large portion of that regular rope drop crowd is often heading directly to 7DMT.
Note, exact opening procedures can vary on any given day at the MK (or any park for that matter) so all times are approx.