A report tells us Apple intends announcing a move to use its own ARM-developed chips inside Macs starting next year, this will be a pillar announcement at WWDC 2020, where Apple will share more information concerning its long speculated plan to sell Macs powered by its own ARM-based A-series processors.
The transition has already begun
Think about it and the transition really began when Apple migrated to OS X. That operating system’s Unix core is what makes it more possible to run the system on different processor platforms. Apple proved this with the iPhone and iPad, both of which run variants of the same OS.