Version migration - what version do we currently have?

We are working to turn terminate profile options on that will move us from the responsive UI to Redwood. However, while we have steps to migrate, we need to identify the version we are currently using. How do we find this information out? I have added a link below that speaks to updating to version 3, but there isn't a mention that speaks to identifying what version is currently in use. Please advise if you are familiar with this question and what you have done to identify the version your system currently has. Thank you in advance.