The first batch of M1 macs were announced on Nov 10th, 2020, and the 16" MacBook Pro hasn't been refreshed with an M* chip yet, so that will probably happen soon. The article claims it will happen "early summer", but within the next 6 months is a pretty safe bet.

Here's a good guide on how long each specific Mac has gone without updating, with guesses on when it's a bad idea to buy now: https://buyersguide.macrumors.com/#MacBook_Pro_16