Odds are not good that you will get a view of wishes from 'Ohana. If the goal is to see the show during dinner, I would not book this restaurant. I also agree with the pp, our August experience there was horrendous. We are not going back soon, and thus was a family favorite.
If you want to see Wishes from outside the park, I would suggest CG if you have never been. The vantage point is the best.
We choose Narcoossees at the Grand lately, but you could book and gf restaurant and then after dinner head to the porch at Narcoossees to see the water pageant and wishes.