After installing the CU1 update the Site version will not change so to check if the update has been installed you can check installed updates in control panel or one of the updated DLL files.
The updated version on the updated DLL files will be 5.00.7711.200, you can see a list of updated files in the hotfix KB2717295.
This is also the case after updating the console no version will change, so again look in the Control Panel or check an updated DLL.