parallel and Mac

[Alan]

I use homebrew and to my dismay I thought I had parallel installed as I see:

which parallel

/opt/homebrew/bin/parallel

but

parallel --help

/opt/homebrew/Cellar/moreutils/0.69/libexec/bin/parallel: illegal option -- -

parallel [OPTIONS] command -- arguments

        for each argument, run command with argument, in parallel

parallel [OPTIONS] -- commands

        run specified commands in parallel

This is NOT GNU parallel.

What is the right way to get GNU parallel running on a Mac?

Alan