If you have the Xerox driver and not an Apple driver like Secure Airprint or some other random Apple thing, you can add it manually if needed via Printers and Faxes > Options and supplies
And it shows up in the driver ala Xerox Features > Finishing
Which will open this
I installed a Xerox 7970 with a C/Z Fold finisher. I installed the driver on a Mac using the installer package from the support site. When I open a document and go to print, the Xerox is selected, but I see nowhere to select the folding options. It doesn't look like the Xerox driver does in Windows. There is no "properties" to get into the settings, only an "Advanced" tab which brings up yet another generic looking window with a few options. Any advice?