You can also use OSDUpdate to add Office Updates in MSP format to your installation media.
You should have a Application or Package directory with your Office Setup source files. It should look something like this
This looks good. If you have a custom MSP for installation of Office, you can leave that. The red arrow is the path that you will need
You will need to create a
OfficeSetupUpdatesPath parameter (to the red arrow above)
This is what the Command should look like
New-OSDUpdatePackage -PackageName "Office 2016 64-Bit" -PackagePath "D:\OSDUpdate\Office\Office 2016 64-Bit" -OfficeSetupUpdatesPath "D:\MDT\Applications\Microsoft Office 2016 64-Bit\updates"
The console output will be quite lengthy
With the proper MSP files added to the Updates directory