But Trump is Pence’s boss........
Trump is absolutely NOT Pence's "boss".
Pence was elected by 303 Electors for Vice President appointed by the State Legislatures, his term ends at 11:59 am on January 20, 2021, and while it is not a good career move for a VP to become the enemy of the sitting President it has occurred before, and although a President (in theory) can make a VP's life hard, he can't order him around and he certainly can't fire him.