There are no Mac viruses that have EVER existed "in the wild" (that means outside of lab and "proof of concept" testing, etc.).
You DON'T NEED ANY "anti-virus" protection on the Mac, with one exception that I can think of.
If you exchange MS office docs back-and-forth with others, it's possible that someone using Windows could pass onto you a doc that has a virus in it (weren't there once "Office macro viruses"?). It wouldn't have any effect on the Mac, but if you modified that doc and sent it back to another PC user, the "infection" might be carried along, too. That's just a precaution I recall from years ago. Never affected me in 33 years of Mac usage.
You DO need malware/adware/crapware protection, however, and it's free:
Download MalwareBytes and run it:
Malwarebytes official site: all-in-one cybersecurity software for all your devices. We provide antivirus, anti-malware, VPN and scam detection for PCs, Macs and mobile devises. Powerful digital protection, always by your side.
www.malwarebytes.com
IMPORTANT:
Select the "home" option.
It's a FREE download
IMPORTANT:
You DO NOT NEED TO BUY A SUBSCRIPTION to run MalwareBytes.
It will run FOREVER IN FREE MODE.
When you open it, IGNORE the button to "Upgrade Now" or "Activate License".
Just click "Scan".
Again, you DO NOT have to buy the pay-for version!