HOW CAN i UPDATE MY SAFARI ON MY MAC

The way Safari is updated is by upgrading your computer's software. An upgrade is when you install a newer version, such as upgrading from Catalina to Big Sur. An update is to install a newer version of the same operating system. The reason for this is because Safari is installed as part of the operating system. It cannot normally be individually installed. Incidentally, a newer version of Safari does not always work with every web site. Sometimes it is necessary to install another browser such as Firefox or Chrome to use with certain web sites. They are individually installed and upgraded.

As stated above... Upgrade your operating system.

Safari is updated or upgraded when macOS is updated or upgraded.

As you are at Sierra macOS 10.12 based on the footer here, you can upgrade to at least High Sierra macOS 10.13.

Here are the upgrades to High Sierra, Mojave, Catalina, Bug Sur, and (indirectly) Monterey:

How to get old versions of macOS - Apple Support

For the newest Safari, upgrade to Monterey. Upgrading to Monterey is an option if your MacBook Pro is from 2015 or newer.

Whichever you pick—your Mac might not support newer versions—use Safari to download the installer.

To upgrade from Sierra or High Sierra, to Catalina, Big Sur, or Monterey, all your installed apps must be 64-bit or updated to 64-bit. Older 32-bit apps such as Office 2011 and earlier will not work on Catalina and later. To find 32-bit apps, use the Go64 tool.

Have a complete and current backup from before the upgrade.