Arm is a global semiconductor and software design company, that designs microprocessors, graphics processing units and neural processing units.
Apple is said to be aiming to transition to its own ARM-based chips starting in 2020. Apple analyst Ming-Chi Kuo believes Apple will release MacBook models with its own custom processors in the fourth quarter of 2020 or the first quarter of 2021.
The last time Apple made a processor switch, it was announced at their Worldwide Developers Conference (WWDC) the year before:
The transition became public knowledge at the 2005 Worldwide Developers Conference (WWDC), when Apple's CEO Steve Jobs made the announcement … The first generation Intel-based Macintoshes were released in January 2006 …
This year’s WWDC is from June 22-26.
This questions resolves positively if Apple announces plans to make ARM-based Macs at WWDC 2020. They don’t have to announce a specific Mac — plans are sufficient.