You can connect your Switch to OSX without any additional drivers.
Tools like NS-USBLoader or CrystalRCM work instantly.
If you have problems connecting and it also doesn't work on another computer then there is a slight chance that something is wrong with your USB port on the Switch. Also there are still some usb cables that only work for charging, no data transfer)
Note that the SD card inside of the Switch doesn't show up like a USB memory stick. (Or at least mine doesn't).
It just shows up as an usb device (Apple logo in the top menu -> About this mac -> System Report -> Hardware -> USB).
The latest Atmosphere has a homebrew app called 'Haze' in the homebrew menu where you can make the the SD card show up as a USB memory stick and copy files from/to it.