The Core i9-9900T remains unavailable in most regions, but several Geekbench listings give an insight into the performance of the 35 W CPU. Essentially a hamstrung Core i9-9900, the Core i9-9900T bests processors with up to 3x the TDP in multicore workloads and is a big upgrade over the last 35 W CPU to enter our offices.
https://www.notebookcheck.net/Core-i9-9900T-scores-up-to-11-more-than-the-Ryzen-7-2700X-in-Geekbench-with-3x-lower-TDP-comparable-single-core-performance-to-the-Core-i7-8700.431233.0.html