The Brother printer "MFC-L8390CDWQJ1" can be used with Apple Mac computers, but there are a few important points to note:

- AirPrint compatibility: If the printer supports AirPrint, it can be used without additional drivers, provided that the printer and the Mac are connected to the same network (Wi-Fi router).
- Driver compatibility: Since macOS 10.15 Catalina, macOS only supports 64-bit drivers. If Brother does not provide 64-bit drivers for the specific model, some functions of the printer may not be available.
- Network connection: A stable connection can be achieved by using an Ethernet cable instead of Wi-Fi, which can be especially helpful with older printers.
- Firmware and drivers: Ensure that the latest firmware and, if applicable, the latest drivers are installed to avoid compatibility issues.

It is advisable to follow the specific instructions from Brother and Apple to set up the printer properly and solve any problems.