Since Apple rollout the Big Sur update, accessing WP-CLI in localwp is a headache, here is the alternate way to access the site shell via python script.

Make sure python3 installed.

Download localwp-cli.py file to your machine

Replace <username> with your mac username in localwp-cli.py file

mac_user = '<username>' # example: dishitpala

Run the below command in your terminal.

python localwp-cli.py