Confirm me - the setup is completed or not

You have the stack up and running.

Hey, I am also a Mac user, how is your frontend showing Volto output, while I ran the frontend , and its showing the classic UI? Can u please help me?

localhost:3000 ?

yeah port 3000

hey bro you can refer it to this doc how to run plone using docker
for backend
docker run --name plone6-backend -e SITE=Plone -e CORS_ALLOW_ORIGIN='*' -d -p 8080:8080 plone/plone-backend:6.0

i have some problem too

you can refer to use docker method. i think it is easier one