The best laptop GPU available is the mobile 4090. It is shockingly expensive though.
Literally released/announced yesterday, pretty much the entire 40 series for laptops, 4050-4090.
Given that a mobile 4090 has almost 10,000 CUDA cores, and the previous 3080Ti mobile boasted about 7500, and the full on desktop 1080Ti managed only 3600 cores. You might say that. Mobile RTX 3060 has a good chance to outperform a desktop 1080Ti as well.
Mobile 4090 is the same GPU as the desktop 4080, just a few cores missing and a lot less power draw.