I use an external mouse and keyboard and keep the laptop on a stand so I don't exactly get feedback of the temps under my fingers as you do. But from touching i

I use an external mouse and keyboard and keep the laptop on a stand so I don't exactly get feedback of the temps under my fingers as you do. But from touching it now and then and from the general noise fan I can tell you that it keeps relatively cool. Relatively meaning that it should be higher than a stock macos install but even then I'd maybe say it runs about 5-10 degrees Celsius higher than that with stock linux drivers.