Hello,
You can check the SEP client GUI if it is installed properly.
Secondly, you can check the System Logs from the SEP client as well if the Latest definitions have been installed properly or not.
SEP client >> View Logs >> Virus and Spyware Protection "View Logs" >> System Logs.
You can get a Computer Status reports and logs scheduled report for Virus Definition Rollout (Snapshots) - This report is available as a scheduled report only.
Check these Articles:
About log types http://www.symantec.com/docs/HOWTO27271
About Computer Status reports and logs http://www.symantec.com/docs/TECH95541
About the different types of Symantec Endpoint Protection Manager Reports
http://www.symantec.com/docs/TECH95538
Hope that helps!!