Currently in the setup & settings of Two-Factor Auth, there is a section called "Active Users" with a link. The link just takes you to list of users. The issue is if you have hundreds of users, you really can't see who has activated it yet. There should be a screen or panel that lists only activated users. At the same time, and more important would be able to see a list of any user that has not activated two-factor.
Thanks for listening (reading)