According to their respective websites, various devices on Verizon and T-Mobile are receiving the April security patch.
For T-Mobile, the Galaxy S8 (new software version: G950USQU3CRD4) and Galaxy S8+ (G955USQU3CRD4) are receiving the April patch, and over on Verizon, the Galaxy S6 (NRD90M.G920VVRU4DRD2), Galaxy S6 Edge (NRD90M.G925VVRU4DRD2), Moto Z2 Play (NDSS26.118-23-19-6), and Moto Z Play (NDNS26.118-23-12-7-7) are also getting the same thing.
If you own one of these devices, get on it.
// T-Mobile [2] | Verizon [2] [3] [4]