Yes and no. Apple has done picking and choosing of benchmarks in the past.
Apple M1 has great IPC per watt. If it just matched something like the Core i5 8000 series, I would have said it's a good CPU.
I just checked out Geekbench, and a lot of the benchmarks actually do things that Apple probably does as part of the SoC instead of the main CPU, or has done main CPU optimization for iOS. Image compression, ML, PDF rendering, Camera processing, etc. It was hard to tell if this was using the main CPU, or other parts of the M1 SoC. Don't get me wrong: it's VERY clever of Apple of leveraging the SoC in a way that others can't.
You can get some information out of it, but I would be careful trusting synthetic benchmarks. The system will be coming out at $4000, so there will probably be loads that will be good for it, but I wouldn't trust a few benchmark as the M1 Ultra being powered by the Ghost of Steve Jobs until we get more data
On the other hand, the Ryzen 3990X is going to be replaced soon. This also means that the 3990X did well vs a CPU that might have been specifically optimized for those particular benchmarks, it says a lot about the Threadripper