I recently purchased a M-Audio Oxygen 49 MKIV MIDI keyboard for my 14 year old son and we connect it to our Mac mini and it works fine. Is there something I can buy to make the keyboard wireless? The goal is to keep it on a stand somewhat nearby the computer but without the wire running from the keyboard to the mac-mini computer. Any guidance greatly appreciated.
You could try using some sort of a Bluetooth or Wireless MIDI adapter.
The one used in the article is: https://www.zivix.co/
I haven't used one of those before so I can't tell how good they are.