The OnePlus 5T Oreo update, as some you might already know, started rolling out late last month. It arrived as OxygenOS 5.0.2. However, due to some issues, the roll out was temporarily stopped. Good news is the update has again started rolling out, and this times, it's arriving as OxygenOS 5.0.3. As for changes, most of them remain the same, just that the change-log now mentions some fixed issues. If you've been waiting for the OTA notification, your wait shouldn't be too long now. Source | Via
Source: https://www.gsmarena.com/oneplus_5t_oreo_update_now_arriving_as_oxygenos_503-news-29462.php