In this screenshot:
why does Monetization show "You're almost done!" ?
I seems bind everything correct I mean about binding YouTube and AdSense.
What do I need to do to activate my AdSense?
I expect that you already linked it and you just now need to wait.
This YouTube support page has more info just in case.
Scroll down a bit, open the item If you already have an approved AdSense account and select AdSense association link from the text.