The new firmware carries build number RMX1801EX_11.A.20 and weighs 2.71GB in size. It comes with ColorOS 6 and bumps up the Android security patch level to May 5, 2019.
The update also brings in Chroma Boost and HAL3 support for the camera, while adding an app drawer to ColorOS launcher. You can check out the full change-log of the update below:
The update is currently rolled over-the-air in India in a staged manner to a limited number of users, and a broader rollout will commence in a "few days" if no critical bugs are found.
That said, if you can't wait for the OTA to reach your smartphone, you can install the update manually. Head over to the source link below for more details.
The Realme 1, 2, U1, and C1 are slated to get their Android Pie updates next month.