We we went in October Wishes was at 9 PM. We had a 7:20 ADR. We waited 40 minutes to be seated, and we were just having desert when Wishes started. We were able to see it really well from out table, but they did not dim the lights nor pipe in the music, we just saw the fireworks. We also saw the Electrical Water Pageant from our table. We had not planned on either, so we were delighted. Many have reported having to wait past their ADR time to be seated at 'OHana and this was our experience. They were very busy.
Hope this helps.