I have the same configuration and have not noticed it getting warm using Lightroom and Photoshop so far. I will say I haven’t really given it a large sustained workload yet. My largest single import so far has only been 100ish images. But overall it seems to be just a faster version of my M1 Max and I’m very pleased so far.
Edit: When you say “just got” your MBP, how recently do you mean? The computer will do a bunch of background tasks in the first few days (indexing, photos face recognition, etc.) and that will utilize the processor. If you have only had the machine 3 days or less, I would give it a little more time to settle down.