The Realme C3 has received a beta build of Android 11 in India back in July, and now it seems like all kinks have been ironed out and the phone is ready for the release of the stable version.
This has started rolling out, and it looks like it's going out to units in India that had the beta installed first. Presumably after a few days (or - worst case scenario - weeks), if no show-stopping bugs are found, a wider release will follow and hit all C3 handsets out there in the wild.
The new build is labeled RMX2027_11_C.04 and for people who were previously on the beta it arrives over-the-air as a mere 168MB download. Compared to the beta, it optimizes performance, improves stability, and fixes known issues.
If you're impatient you can grab your Realme C3 and go to Settings > Software Update to manually check if the new release is available for you.