don't see anything on computer to update safari! i'm currently at 12.1. help!

The Safari version depends on the macOS version installed. To determine that, please read Find out which macOS your Mac is using - Apple Support.

Safari version 12.1.2 was released July 22, 2019: About the security content of Safari 12.1.2 - Apple Support. The latest version is 16.4.1 and requires macOS "Big Sur" or later.

Safari is updated along with macOS. To learn how to do that, please read How to update the software on your Mac - Apple Support.

no more safari?

I don't understand that question.

It's the other way around. Big Sur incorporates Safari. All macOS versions incorporate Safari.