How do I knowThat I have the latest version of Safari?

Hello Mdlcharlie,

We understand that you would like to ensure you’re running the most recent version of Safari on your Mac. We’d be glad to assist. 

The latest version of Safari is Safari 15 as shown here:

About the security content of Safari 15

To keep Safari up to date on your Mac, install the latest macOS updates.

Update macOS on Mac

Cheers!