Oneplus has started pushing out the October 2021 security patch accompanied by the iterative software update of OxygenOS 11.0.4.1 for Oneplus 7T Pro devices.
Oneplus 7T Pro was released on 12th October,2019 with Android 10 out of the box
This update is available for IN, EU and GLO regions. This is a phased rollout and is expected via OTA. The OTA is supposed to reach a wider audience in the coming days once it's devoid of any bugs.
Related:
Oneplus 7 & Oneplus 7 Pro: OxygenOS 11.0.4.1 with October 2021 Security Patch, is being rolled out with an almost similar Changelog of 7T & 7T Pro.

Source>>Oneplus community
| Android OS | Update | Release Date/Status | Estimated Months |
| Android 10 | Out-of-the-box | October 2019 | Nil |
| Android 11 | First OS update | March 2021 | 16 months |
| Android 12 | Second OS update | Eligible | Unconfirmed |
| Android 13 | Third/Last OS update | Eligible - Not sure yet | Unconfirmed |
Also Read>>> OnePlus Android 12 update list
The OnePlus 7T has received one major OS update with Android 11. But Oneplus has promised 3 year OS updates for its flagship series of devices.
Hence, it is eligible to receive two more major OS updates with Android 12 and Android 13 expectedly.
The OnePlus 7T Pro OxygenOS 11.0.4.1 Update is currently rolling out. It is expected to expand to other regions reportedly and will soon follow.
If you’ve not received the OTA notification yet, then please follow the below steps:
check system updates manually by heading over to Settings > System > System Updates
For more OnePlus Android updates please download our android app – available on the Play Store