Moto Z Play rolling out with android security update for the month of April. Currently the update is hitting the Canadian units on Koodo's Network and some Brazilian units, users reported about the update via reddit.
The update arrives in with build number NPNS25-137-24-1-9. Along with the latest security patch the update brings lots of improvements in UI and fixes for specific vulnerabilities in the Android operating system.
No official words about when other regions will get the update has came yet. But as the units in Canada and Brazil have started receiving the update we will it won't take much time to reach other regions as well.
As usual it's an over-the-air update will roll out gradually so be patient. You can also check manually whether the update is available for your device or not by heading over to Setting's menu of your device.