If you get there early and you will want to see the fireworks from the restaurant, they will need to seat you. You will not be able to see the FW's while waiting - UNLESS you go out to the beach...
The Electric water parade starts at 9:00. SOMETIMES Wishes will start at 9:00 as well - you'll need to check the calendar
When we went to Ohana's, we had ADR's and still waited forever - it was SOOOO crowded - there was no way of being seated early.
but 9:30 is a late ressie --- you may get lucky and be able to be seated early. If I were you, I would see if you could change your ADR time to an early time - UNLESS WISHES starts at 10:00 on the night that you are going. Then your 9:30 time will be a perfect time to arrive and be seated. Ask for a window table.
Do you know where to find the calendar of all of these hours (Wishes) on this website?