I wrote a bash script to put a colour dot in the mac menu bar to represent the CPU temperature. I barely used it when I was on Intel, and it doesn't work on Apple Silicon. It's now only possible to ask for the thermal pressure, and be told a descriptor, always 'Nominal' in my case. I wrote the change but haven't pushed it.

https://github.com/tobylane/Bin?tab=readme-ov-file#tempinbar