With every new release of SCCM in Current Branch, you need to validate that the client versions have upgraded and this exercise needs to be done repeatedly.

The below query should display primarily 4 results which is the older version and the newer version grouped by Servers and Workstations when you are migrating and than down 2 results once all the clients have upgraded.

SQL Query:

The ones that don’t migrate might have client health issues which might need more attention. That said hope your results are not like the screenshot below: