Average time between when a security bug is introduced in the linux kernel and when it detected is 5 years. [0] But because people don't update their shit, 99.9% of exploits in the wild involve bugs that were patched over a year ago. [0]

If apple fixed a security bug in big sur, I'd like to update sooner rather than find out in a CVE next month that I should have actually upgraded ASAP.

That said, waiting at least a few days to see if any problems shake out is probably a good idea.

[0]: https://paragonie.com/blog/2016/10/guide-automatic-security-...