The update brings the build version number G770FXXU3DTL1. The update file size is around 2GB  so while downloading this make sure to use Wi-Fi to avoid data charges.

The latest update adds One UI 3.0 features which bring improved UI, better usability, refined quick panel, and also the new features of Android 11. Unsurprisingly, Samsung also includes December 2020 security patch in the latest update. As of now, the company has not added all the changes in the update changelog.
As usual, the Galaxy S10 lite will get One UI 3.0 update in a phased manner. So, it may take some time to reach your phone. Alternatively, you can manually check for the update by navigating to Settings -> Software updates -> Check for updates.

 G770FXXU3DTL1  Galaxy S10 Lite receives Android 11 based One UI 3 0 update - 28