Microsoft releases Dynamics 365 updates periodically. You may want to see which is the current and next version for your region. To do this, go to https://docs.microsoft.com/en-us/business-applications-release-notes/dynamics/released-versions/dynamics-365ce#latest-version-availability.
For example, below we see a list of updates per region:
In this case, North America Station 5 is on version 126.96.36.19945 Service Update 168, with the next version 188.8.131.5254 Service Update 171 being rolled out on 5/22.
Clicking into one of these release links will show details about the release:
In order to find when these releases are scheduled for your environment, go to https://admin.microsoft.com/ and under Health select Message Center:
Filter by Dynamics 365:
Selecting an update will provide more details: