Why would anyone want a wireless keyboard? The constant changing of batteries and wondering if the bluetoof is sync'd up or not. A wired keyboard just works. No turning it off and on. No changing batteries. No configuring bluetooth settings. None of that crap. Wired keyboard you just sit down at it and start working. Simple as it gets. Besides, a keyboard is usually sitting on the surface of your desk, within a few feet, or less, of the computer it's attached to.
Wired is the only way to go.
OP, you have a Macbook pro. That's a laptop computer. I.e. it has a built in portable keyboard. You don't need a second portable keyboard.