They are already available: https://browser.geekbench.com/v4/cpu/search?dir=desc&q=MacBookPro15&sort=score
tl;dr;
The 13-inch base processor gets about 4500/16500 vs i7 getting 5200/18000 (single core/multi core)
The 15-inch base gets 5000/21000 vs i9 getting 5500/24000
tl;dr;
The 13-inch base processor gets about 4500/16500 vs i7 getting 5200/18000 (single core/multi core)
The 15-inch base gets 5000/21000 vs i9 getting 5500/24000