Which macOS version is installed? From the Apple menu in the corner of your screen, choose About This Mac. You should see the macOS name, such as macOS Big Sur, followed by its version number. If you need to know the build number as well, click the version number to see it.
What version of Mac OS can I upgrade to?
If you're running any release from macOS 10.13 to 10.9, you can upgrade to macOS Big Sur from the App Store. If you're running Mountain Lion 10.8, you will need to upgrade to El Capitan 10.11 first. If you don't have broadband access, you can upgrade your Mac at any Apple Store.
What is the latest version of macOS Catalina?
Current Version - macOS 10.15.
The current version of macOS Catalina is macOS Catalina 10.15. 7, which was released to the public on September 24.