Plex never announces such timelines.
Glad things are working for you.
The Windows 64 bit version is recent, released on September 14, in 1.29.0.6209.
Zero-copy transcoding for Nvidia GPUs was added to the 64-bit builds a few days later, in 1.29.0.6219.
AFAIK, tonemapping on Windows still uses the CPU. I’ve seen no posts otherwise.
Apparently the performance boost provided by zero-copy transcoding makes tonemapping on Windows feasible.