FWIW, the current king of single core Geekbench is the M3 chips. Even the base M3 scores as high as the i9-14900K and higher than the Ryzen 9 7950X3D, at less than half their TDPs.
The top consists of what appears to be an Intel i3-10100 overclocked past 13GHz(!), a Ryzen 7 5800H at 2.8GHz, and then an i9-14900K at just below 800MHz.
That page ranks individual test run, so the top ranking are filled with outliers of internal system or crazily overclocked liquid cooled behemoth. When a CPU has appeared in sufficiently many test runs, the aggregate result, which is more representative of the real performance, will appear on https://browser.geekbench.com/processor-benchmarks.
The i9-14900K and M3 actually haven't appeared in the official chart, but you can search for them as they already have thousands of test runs[0][1]. Both of them score around 3100 in single core, and around 21000 in multicore (for the M3 Max).
Are we reading the same scores?
https://browser.geekbench.com/v6/cpu/singlecore