I have read that Google engineers worked in an Apple Magic Trackpad 2 driver for Linux, back in September. Is this driver available in Juno? Can you use it with multitouch gestures support?
As far as I know Magic Trackpad 2 support will only land in Kernel 4.20, to be released in a few days. This kernel could come to elementary via the Ubuntu Hardware Enablement Stack in February 2019, but I am not aware of any definitive announcement which kernel version that will contain.