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When viewing Patch My PC Updates dashboard in Advanced Insights for Intune, viewed by device in any table (not by patch), you can see the column "Last Catalog Scanned" and gives the catalogue version number.
This version number isn't entirely helpful when thinking about the question "how long ago is "-12 behind" or "-500 behind" - most customers aren't familiar with how the catalogue version number increments so this feature request is to either replace this, or in addition to, display the date of when the client last scanned the Patch My PC catalogue.
This is separate from the following feature request, which would also be a valuable addition to help answer the same questions so customers can easily rule out stale devices when looking at the data: https://ideas.patchmypc.com/ideas/PATCHMYPC-I-7119
Thanks for the Idea - we have added this to our development Backlog.