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 9.1.0.16845 Service Update 168, with the next version 9.1.0.17154 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:


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