Update README for FA3

Author: tridao

Diff for: README.md

@@ -40,15 +40,12 @@ This is a beta release for testing / benchmarking before we integrate that with
 the rest of the repo.
 
 Currently released:
-- FP16 forward and backward
-
-Coming soon in the next couple of days / next week:
-- BF16
-- Variable length (FP16, BF16)
-- FP8 forward.
+- FP16 / BF16 forward and backward, FP8 forward
 
 Requirements: H100 / H800 GPU, CUDA >= 12.3.
 
+For now, we highly recommend CUDA 12.3 for best performance.
+
 To install:
 ```sh
 cd hopper