in RU7 you need to enable sylink log to check if clients are getting updates from SEPM
and there is no report which lists the total number of gups in your environment.
HKEY_LOCAL_MACHINE\Software\Symantec\Symantec Endpoint
Protection\LiveUpdate.
Check the settings for the following keys:
■ UseLiveUpdateServer
If this key is set to 1, the client uses an internal LiveUpdate server or Symantec LiveUpdate directly.
■ UseManagementServer
If this key is set to 1, the client uses the management server.
■ UseMasterClient
If this key is set to 1, the client uses a group update provider.
https://www-secure.symantec.com/connect/forums/how-verify-sep-are-updated-gup