[OMG keylogger cable]

https://shop.hak5.org/search?type=article&q=macos

These are the macos payloads I found, you could probably create one or find more on other sites.

[OMG keylogger cable]

It should work on a apple keyboard since that is when I first saw it used, as for payloads you might need to spotlight search to pull up the command terminal, also all the terminal commands are also going to be different, so you would need to translate whatever payload.

[Hackers: From playground to battlefield. - A study of Hackers ‘insight on their underground world.]

I'd check TheRealDeal, dark0de, Mazafaka, Trojanforge, hackforum etc. for finding this information