I would wait till November if you can, even if you don't get the 2020 model there will be a discount on the 2019 version.
First, no November Mac event has been announced. That's often when new Macs get announced in a typical year - so it's a plausible guess - but in case you haven't noticed this hasn't been a typical year (apart from the pandemic, Apple Silicon Macs are the biggest Mac upheaval since the Intel switch - we can only hope that Apple
doesn't release them until they are ready...)
Second, although nobody knows for sure, most of the speculation is that Apple will release a 13" (or 13" replacement) MacBook and maybe a 21.5" iMac replacement first. That makes sense - the MacBook Air/entry-level 13" MBP are the "low hanging fruit" that will benefit most from low-power chips and - along with the 21.5 iMac. Heck, they could put an iPad chip in the Air and it would out-perform the Intel version - it could even live without Thunderbolt.
I really wouldn't bet the farm on ASi replacements for the 16" MBP and the 5k iMac this year - they've got more to prove and may have to wait for some sort of "Apple Silicon Pro" - in particular to convince people they don't need a dGPU. Apple said that the transition would take about two years so its not reasonable to expect a complete ASi Mac range to materialise just 6 months after the announcement...
The thread starter is also dependent on AVID and Ableton - and, while I don't doubt that they'll get native Mac versions eventually, there's no promise that they'll be there on Day 1. Maybe they'll be OK with Rosetta - but it's unlikely that they'll get a performance boost that way. However, in both cases, the likely headache is going to be with third-party plugins and hardware drivers where there are bound to be stragglers and a few that just don't make it.
It all really depends on whether you depend on your Mac to get paid work done or, alternatively, you enjoy tinkering and don't mind running two systems side-by-side for a while. Just remember - the early worm gets the bird (or, if you prefer, the second mouse gets the cheese...)