Tony Smith, aka smittytone, has written two articles that are well worth a read if you’re trying to develop for the new Raspberry Pi Pico with a Mac.
The first is how to program a Pico in C and the second is to do with debugging the Pico with another Pico and a Mac.
Having a range of development platform options for the Pico is, I think, key to making it a success in the Pi community. So, thanks to Tony for working it all out!