Fantastic On the Go Dining Package Question

[DisneyDad79]

I was wondering if anyone had done the Fantasmic! on the go dining package at Hungry Bear. Specifically, I was wondering how sticky they are with the arrival time since it is normally a quick service restaurant and it is a grab and go type package. We have dinner reservations at 4 PM on Columbus Day and I think we will be running behind. Any info is appreciated!!