GTA RP became one of the most-watched gaming categories on Twitch over the past few years. The expectation that it transitions to GTA 6 is reasonable, but the timeline is misunderstood.
For the wider RP map content, see the RP server map hub.
RP requires several things to exist
A multiplayer framework that lets servers run their own rules. Custom interiors and locations (MLOs). A scripting environment for jobs, economy and progression. A community of players who want to commit. None of these exist for GTA 6 yet.
The first three follow the PC release timeline. The fourth is partially in place - the existing GTA RP audience will follow the format if a viable platform arrives. For rpservers.net and similar discovery destinations, the early-GTA-6 era will be active.
When meaningful RP servers will exist
Not at launch. The PC release lands later. The framework lands after that. The first serious RP servers probably stand up within a year or so of PC release - plausibly less if Rockstar's Cfx.re-derived framework ships quickly, more if it doesn't.
NoPixel-tier polish takes years to build. Don't expect launch-tier RP at GTA 6 PC launch.
What might be different from GTA 5 RP
The map. Vice City and Leonida give RP servers a different geographic vocabulary - beach culture, tropical climate, Keys content, wetland content. The standard NoPixel-style police-station-and-mechanic-shop core works in any setting; the regional flavour will be Florida-coded.
The framework. If Rockstar ships official RP support via Cfx.re, the bar for new servers might be lower than it was for GTA 5 - which would mean more servers, faster, with more variation. Anyone planning to run a server rather than join one will hit the practical question of where to host it; commercial GTA 6 server hosting options will appear well before the PC release does.