On the website I can’t find what the current version is for download. I eventually found that if I hovered over the download links I could see the version in the URL.
On Manjaro itself I don’t see the version number in the settings. It shows lots of other versions, like KDE Plasma Version, Frameworks, Qt, Kernel, but not the Manjaro version. Show more information also doesn’t reveal it. Apparently I either have to cat /etc/lsb-release, or open the Manjaro Hello program to find the version.
My suggestion is to list the version number on the website download page, and in the About this System page in the GUI.