Famed Apple analyst Ming-Chi Kuo suggests that Apple's A-series processors could be coming to Macs sooner rather than later. In a note seen by 9to5Mac, he suggested that the first Macs with Apple's own processors instead of Intel's could come in 2020 or 2021. In April, Bloomberg reported that the switch to Apple's Arm-based chips would come in 2020, so this corroborates that report.
This could free Apple from Intel's processor roadmap, which could allow the Cupertino, Calif.-based company to make more frequent updates to the Mac. However, Arm-based chips are unlikely to take on Intel's highest performing chips (like the ones you find in high-end MacBook Pros and desktops), so it could move out in stages. It could also mean more profit for Apple.
Kuo's note also forecasts TSMC as the sole supplier of the A-series processors, including a predicted A13 in 2019 and A14 in 2020. Apple's rumored plans to move solely onto its own chips could be a big deal for TSMC, which could see a big windfall.
This would pose some big questions about a platform change. It wasn't long ago that Apple made the switch from PowerPC to Intel. Now, it could make developers ship versions of apps built for Arm processors. Apple's plan to bring iOS apps to macOS witih AppKit and UIKit could make it easier for some developers.
The research note also suggests that TSMC will work on Apple's long-gestating car program. Kuo suggests that TSMCs 3nm or 5nm chip processes will enable fully autonomous driving.