I got the llama 65B model working on my M1 MacBook Pro, although not alpaca on top of it yet. The models are VERY slow unless you have enough RAM to fit them in. The 65B one is basically unusable with my 16GB of RAM (it produced about 8 words in 45 minutes). However, the 13B one works at a reasonable speed and the 7B is fast.

Note that the 65B model requires around 300GB of free disk space to prepare.

I followed the instructions here: https://github.com/simonw/til/blob/main/llms/llama-7b-m2.md