To check Office 2016 product key with command

First open Command Prompt, then type and run with the corresponding command:

For 32-bit Office and 32-bit Windows: cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /dstatus

For 32-bit Office and 64-bit Windows: cscript "C:\Program Files (x86)\Microsoft Office\Office16\OSPP.VBS" /dstatus

For 64-bit Office and 64-bit Windows: cscript "C:\Program Files\Microsoft Office\Office16\OSPP.VBS" /dstatus