Is GTA 6 Available on PC?
Source check
Rockstar’s current launch listing shows PlayStation 5 and Xbox Series X|S. It gives no PC release date.
Where to check for a PC announcement
Start with the official GTA VI page and check the platforms listed beside the release date. A console purchase gives you the game for the listed console ecosystem. Check for an official PC listing before paying for anything advertised as a PC copy.
If you have a supported console, the download hub links to both console storefronts.