The upcoming Halo TV show now has its own canon status! It falls under something called the "Halo Silver Timeline".

According to @k_wolfkill, this was done to help protect both the Core Canon and the TV show's story, letting each evolve to best suit the medium that they are on. pic.twitter.com/e3YAv5UDUm

— Halopedia (@Halopedia) December 16, 2021