For how long will Adobe support Catalina?

>>>Up to what date will Adobe CC guarantee to run on Catalina?

Think we'd all like to know that. Given that Adobe apps still support Mojave, you're probably safe to say Catalina will at least be supported for 2021 and perhaps deep into 2022 (don't quote me on that). Beyond that it's anyone's guess.

Keep your eyes on the official Adobe blogs. You'll probably read it there first.

Photoshop: https://blog.adobe.com/en/topics/photoshop.html

>>>I need to know when to buy a new mac.

That's no longer a simple choice since you've now got to choose between Intel-based and M1-based Macs. M1 is obviously the way of the future but when's the right time to buy one?

This is a public forum, not Adobe support... other users do not know Adobe's future plans