No, I have no clue. I don't even know my current version (number nor codename). But when I need to check, I click the Apple logo in the top left, "about this ma

No, I have no clue. I don't even know my current version (number nor codename). But when I need to check, I click the Apple logo in the top left, "about this mac," note the version number and then search Google for "latest macOS version" (it took a long time to break the habit of typing "OS X").