In case your brother printer is offline on Mac then you should try to make it online by following given steps: go to start menu and click or device and printers. A printer list is displayed. Select your brother printer and set your printer is default. Update your printer driver as well as install your printer driver.
Steps to make brother printer online
Brother printer offline to online
Brother printer offline on Mac.
How to make brother printer online on make
Brother printer offline to online on Mac