The easiest way to check that the SD Card you have created is working is to connect to the device over the serial port. Picocom is a great tool providing terminal emulation over USB serial. For OSX a quick install can be performed via : brew install picocom Plug your Mac USB-C cable into the USB-UART port on the Maix 2 board. You can connect to the device using the USB serial device.
All the forum posts I could find assumed access to either Windows or Linux machines to burn the firmware onto an SD card. I needed a couple of goes at this when trying from my Mac. The main issue I had was how to remove and recreate one partition from the initial image. i.e. how to grow that partition to use the remaining space on the SD Card. I found a way of using Virtualbox to do this as outlined below.