How do I determine if PDQ Deploy is really installing O365 C2R updates

We are moving to the O365 Click-to-Run flavor of Office (2013 and 2016). Given that WSUS does not patch O365 Click-to_Run versions of Office, we've been trying to use PDQ Deploy. We think it is working because we can see the version number change in the Office products. We are able to roll-back and roll ahead. For instance, right now my O365 Click-to-Run (office 2013) shows version 15.0.5075.1001). If I change the Variables in PDQ and set that Value to the latest version and run it against my machines it will change the version in Office. How can I tell if the machines are actually getting the updates and not just getting a cosmetic change? There is nothing in the Windows Application Event logs that indicates updates are being installed. There is nothing listed in Programs and Features\View Installed Updates that indicates new stuff. Any ideas?

I should mention that when I monitor the network activity on the machines during the updates there is definitely traffic, it stops after the updates are done. There is also about 300MB less free space available on the machine after the updates. So, it appears to be working.