How to "UPDATE" Safari
How do I update Safari on my iMac?
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Safari is updated when you update or upgrade the macOS on your iMac.
If you have a recent macOS (Monterey or Ventura) you may have a Safari update to Safari 17.2.1 via Software Update.
The model year of an iMac is available at Apple menu > About This Mac.
An early 2009 iMac can be upgraded to El Capitan 10.11.6 but no later version
A late 2009 through mid 2011 iMac can be upgraded to High Sierra 10.13.6 but no later version.
A late 2012 through late 2013 iMac can be upgraded to Catalina 10.15.7 but no later.
A mid 2014 and late 2014 iMac can be upgraded to the latest version of Big Sur macOS 11 but no later.
A late 2015 iMac can be upgraded to the latest version of Monterey macOS 12 but no later.
A 2017 iMac can be upgraded to the latest version of Ventura macOS 13 but no later.
For all of the above, see instructions in: How to download and install macOS - Apple Support
A 2019 or later iMac can be upgraded to the current version of Sonoma macOS 14. See:How to upgrade to macOS Sonoma - Apple Support