As system admin sometimes you need to know the wp version your site in. If your site using the latest version, its easy, you need to scroll down the page in the admin area and look for the WordPress version on the bottom right of the page.
but if your site is not up to date, bottom right will show the “Get version x“. In this case, you need to click on the WordPress icon on top left(when you logged in as admin):
Or go to the following URL to see the current version: