If we want to be sure we are working with the last update of the Teams Desktop App, we only need to click on our profile picture in the App and them in “Check for updates”. In this way, we are forcing to install last updates of the Apps so we can start using them. Of course, if there are not updates for the Apps, nothing is going to happen behind the scenes:
In case we need to know Teams App version installed, we have again to click on our profile picture in Teams and then in About –> Version.
In this way, a new banner will show current installed version of the Teams App.