The earliest PS times are 10 minutes after park opening. Right now, since official park opening is 8am, 8:10 is the earliest PS time. If it's an EE day, the restraunt is open during EE (yes the characters are there) and even if you have a later PS, you can still come in during EE if you have EE. Right now (and I don't see this being discontinued), PI CMs are going out to the main gates during EE to bring non-EE guests in for breakfast during EE time.