https://arstechnica.com/information-technology/2020/10/apple...
That said the checkm8 exploit requires (as far as I’m aware) physical access to the target device, which is a fairly constrained attack vector for any real world attack. Obviously if you are at risk of such attacks though then your risk profile is _vastly_ different and the steps you need to take are also different.
"But the T2 also contains a vulnerability, known as Checkm8, that jailbreakers have already been exploiting in Apple's A5 through A11 (2011 to 2017) mobile chipsets. Now Checkra1n, the same group that developed the tool for iOS, has released support for T2 bypass."
"Computers that have the Apple T2 Security Chip": https://support.apple.com/en-us/HT208862