I didn't see anything here, yet. So, thought I'd throw it out there. As per the other carriers, T-mobile released they August 1, 2018 security patch today. Looks like it's just only the security patch, nothing more.
Less than a month late - not bad. (It was released to the public by Google on August 6th if I recall correctly (and on the 7th if I don't). It was released to Samsung back in July or or earlier.