I navigated through the Xbox Insider hub, and one of the available previews were the MCC Insider program. So I joined, installed and here I am still waiting for an update. Perhaps I needed an invite for the Season 7 flight, I’m not sure.
Check your insider profile if at the bottom it says active and you still haven’t seen the update restart your console if it doesn’t say active then you might not have been selected I know when I downloaded mcc insider I had to restart my Xbox for it to start downloading the update
Restarting my xbox allowed me to install the update.