All lunch venues open at noon.
It will be open by the time you are in the ship.
There are guests without real PATs - those who ride various
DCL buses. They may arrive before you, but still typically wait for Boarding Groups to get called. That’s the number that makes the bigger difference.
You just wait in a line until your time group is called.
Parking lot doesn’t open until 10:15 or 10:30.
If dropped off, 11:15 would work to allow for luggage drop-off and getting in line.
11:30 is one of the earliest PATs offered. Maybe there’s one before?