The devices’ respective software support pages have been updated with new release notes for the upcoming updates. Both the Moto G7 Play and Moto E5 Play are receiving June 2019 security patches.
The same update also fixes bugs and improves the stability of these phones. The story is the same for the Moto E5 Plus, only that the security patch level is dated May 2019.
OTA updates can take several days before all units receive the download notification, so be patient as you wait for your turn.