I have seen a lot of confused folks about how the Halo Infinite Campaign’s launch will be handled.
The answer is: You will get the update when everyone else gets it, on the launch day at 10AM pst.
Source:
/r/halo/comments/rb0ltl/comment/hnm38g3/?utm_source=share&utm_medium=web2x&context=3
(note, this is the end of a reddit link. simply go to reddit and paste this at the end in your search bar)