Don't know about op, I had a script that would go through each plugin folder, check if it was a git folder, and pulled.

Now I use vimplug though

▲ porridgeraisin 5 days ago | parent [-]

  git submodule update

	▲	t_mahmood 5 days ago \| parent [-]
		Hmm, when I set it up, mercury was a thing, so, the script handled both. And, also, I was young, and that made me feel good :D