Your IT manager wants to know what Exchange 2016 version the company is running, to do this you could run the following command:
- Get-ExchangeServer | Format-List Name, Edition, AdminDisplayVersion
You can compare the build number to the TechNet article below to see what CU you are running:
You could also go to the control panel and then click on Programs and features and view the installed updates and it will also tell you what version of Exchange 2016 you have installed.
Lastly, in the Exchange Admin Center (EAC), you can also click the servers tab and you will see the build number of each server.
Hope it helps.