It depends on whether you're asking about trying to get a table with a view or not. If you get an 8:50 pm ADR, I think you'll be in the middle of your one course when the show starts (i.e., meaning the food is on the table and you're in the process of eating when you have to head out to the observation deck). Personally, I would move your ADR up to at least one hour before the start of the show (75 minutes is better). That gives you time to check-in, be seated, order, and then eat your meal before the show starts. I'd rather have to wait a bit after finishing my meal instead of heading outside halfway through the course. If you're asking about requesting a window table with a view of HalloWishes, by 8:50 pm, all of those tables are likely to be taken. You'd need to make an ADR for at least 2 hours before the show if you wanted a chance at a window table.