There’s an updated (October 2019) Dynamics 365 for Operations Server Licensing Guide. The main changes are for the licensing changes that will happen in October 2019: references to the Unified Operations plan are removed, and From SA User SLs become the only option for moving to the cloud. As usual, check out the Change Log for full details on page 24.

Find this Licensing Guide here: http://bit.ly/MSLicensingGuides.