Updates delivered via "Windows 10 Servicing" or through "Surface Drivers and Firmware Updates" features never report "installed" numbers
Software Updates delivered via "Windows 10 Servicing" or through "Surface Drivers and Firmware Updates" features never report "installed" numbers. They report how many systems require the updates, or how many are unknown or not required. This makes it hard to tell how many systems have updated, especially when we're testing new drivers or new operating system versions. There are other ways of determining what OS versions are out there, but none that really help us determine which OSes upgraded to 1709 by a Windows 10 Servicing software update Vs. a Windows 10 1709 OS Upgrade task sequence (at least these can be determined by task sequence reports) Vs. clicking "Check for Updates" and going online to Microsoft Update.
Likewise, Surface drivers and firmware updates deployed through the "include Microsoft surface drivers and firmware updates" checkbox in the SUP properties report required/not required/unknown but do not report installed.
I have an opened bug with premier support on this. o365 updates behave in the same way.