A leaker has outlined a possible roadmap for Apple's transition away from Intel processors. According to the post, an ARM-powered MacBook Pro 16 will arrive in 2021, while the company will not bring ARM versions of the iMac Pro or Mac Pro to market until 2022.
https://www.notebookcheck.net/Leaker-outlines-possible-ARM-transition-roadmap-for-Apple-ARM-MacBook-Pro-16-to-arrive-in-2021.486586.0.html