Is it possible to detect the cmd key on mac?

I'm not sure if you can detect that specific key or not as I've never owned a mac, but you can make a script which prints the value of every key you press, then press the cmd key and see if it printed anything.

game:GetService("UserInputService").InputBegan:Connect(function(iobj, gp)
	if gp then return end
	print(iobj.KeyCode, iobj.KeyCode.Value)
end)