A new OnePlus 7T update is now making its way out to the public.
The update is OxygenOS 10.0.8 for most of the world, but folks in India can expect to see OxygenOS 10.3.1. Included are optimizations to RAM management, improved system stability, the January 2019 Android security patches, and a few other changes.
Here's the official update changelog from OnePlus:
System
Network (India Only)
Cloud Service (India Only)
Work-Life Balance (India Only)
As with most OxygenOS updates, this new OnePlus 7T update wil be going out incrementally. That means that only a small number of users will see it today, but the rollout should expand in the next few days.