Where in the program can I verify the version #?
In the Main Menu -> Help -> About Zettlr
I had wondered if there was another place to view this. My "about" says I'm running 1.3, but if I try "check for updates" Zettlr says I have the latest version. I'm on Windows.
1.3 is indeed the most recent version. 1.4 is still in beta. If you'd like to be notified about these releases as well, you'll have to switch on the respective option in the preferences: