First you're only talking about a few days, during the holiday season, that you haven't noticed any updates. Could it be possible that everything was updated and those that were not, were not because developers have taken time to be with their families? Just saying.
In the meantime, do you have automatic updates enabled? If you do these updates can happen in the background without intervention.
To do what B. Diddy suggests, go to your Play Store app>click on your profile pic in the upper right corner>Manage apps and device>Updates Available and check this list. I have a Google Drive update so if you have that, there might be one there when you check. I looked and was not able to find an old feature that used to show in this area called, Recently Updated, which was a list of, as the title states, your most recently updated apps. When this feature existed it was possible to see what had updated or installed recently, making troubleshooting some issues easier.
Anyway, let us know what you find and best wishes.