I'm a Mac user. For 35 years now.
This is another one of those "scares" that I ... well, that I don't worry about too much. As in, not at all.
As of right now, Apple has issued only "a fix" (via Software Update) for their latest version of the OS, "Monterey" (OS 12.x). If one is running any version of 12 up to 12.5, the security update gets you to 12.5.1.
But if you're using ANY earlier version of the OS... there's no security update. At least... not yet. I reckon that amounts to close to 50% (or more) of current users.
Then again, the "flaw" discovered may not impact versions of the OS earlier than 12. Can't say because I don't know.
The Mac Mini I'm typing this up on uses OS 10.14.6, so it's not "update-able". It will stay where it is.
My 2021 MacBook Pro does have Monterey, but I'm kinda hesitant to update it until I'm sure that update won't BREAK anything else I currently use (as often happens).
Again, this is one of those "if you don't do this, the world will fall apart" hysterias that in real life will affect next-to-nobody.
I don't even run any anti-virus utilities, because there has never been a single Mac "virus" discovered "in the wild" since OS X was first released back around 2002.
This are such things as malware, adware, etc. For this, I use the free version of MalwareBytes and run it now and then -- scans and is done in about 20 seconds.
There probably aren't too many Mac users here in the forum, anyway.
But if there are -- if you have a problem, I can fix it (or direct you to help)...