Kristie:
You're right that
'Ohana sports a menu that makes it one of the most sought-after reservations at Disney. Its all-you-can-eat service of skewered shrimp, chicken, steak, and pork ranks it a favorite in our family, too. Best of all, your children will be the right age to enjoy the restaurant's coconut races!
The Magic Kingdom's fireworks show, Wishes, does not have a set time each night. Because I don't know your exact date in June, let me recommend that you take a peak at the park's calendar
here for the date you have your 'Ohana reservations to see if the fireworks will begin within an hour of your reservation. If so, you're likely to see the restaurant dim its lights and pipe in the accompanying music to highlight the fireworks.
Wishing y'all a magical vacation!
Whitney