Those upstairs have asked for a count on our environment. I have managed to pull the data from operating systems, but I am wondering if there's a script or a report that I can find that will give me the version/revision number for SQL.
Download the MAP tool from Microsoft and run a scan.
https://www.microsoft.com/en-us/download/details.aspx?id=7826
If they have appinsight on them this will get them
SELECT Name, NodeID, Availability, LastTimeUp, TimeStamp, TemplateDescription, InstanceName, ProductVersion, ProductLevel, Edition
FROM Orion.APM.SqlServerApplicationAlert