T-Mobile's OnePlus 7T Pro 5G McLaren is now receiving an update that brings the phone up to the May security patch. The OTA coming is a build number 10.0.35.HD61CB. In T-Mobile's software update charts, the changelog only mentions "5G band enhancements" and it complies with Google's May security patches. The update officially became available on Friday and should be available for download now. To manually check for an update, head to the Settings > System > System Updates. Source
Source: https://www.gsmarena.com/tmobiles_oneplus_7t_pro_5g_mclaren_gets_may_update-news-43382.php