What is the latest version
I'd like to suggest a prominently displayed link/button to https://releases.1password.com/ in your home page.
Also, in the Linux app, to determine which version you have you have to use vertical "..." -> "Settings" -> "About" to see the what release you have. I suggest "About" being in the left panel and that there be a link to https://releases.1password.com/ in the "About" dialog.
In the Mac app it's "good" enough in that in the "About" dialog, which is at the expected location in "1Password" -> "About 1Password", there is an "You're up to date!" message and a "Check for Updates" button.
For all the apps I believe the the best solution would be to have this information in the left panel, YMMV :)
/Wink
