We have an on prem environment, where do we go to generate license usage similar to what we used to get in the past?

I've been wondering the same thing.

Citrix is working on it to make it visible in Citrix cloud. For now you only can do it following the steps in this link. https://community.citrix.com/techzone-blogs/platform-services/reporting-on-user-session-usage-in-citrix-virtual-apps-and-desktops-after-las-transition/