If you’re interested in deploying Office 2019 in your company, this is your lucky day. Microsoft is making available Office 2019 for on-premises customers.
Predictably this is the last version of Office for on-premises users, so it is expected that the new versions to come, will be based on O365 services. Office 2019 will only run on supported versions of Windows 10 (Semi-annual Channel), Windows 10 LTSC 2018, and the next LTSC version of Server. If you are running an older version of Windows or Server, you will not be able to install this version of Office.
If you want to try this beta version, you have to visit the following link and follow the steps mentioned there.
In case you want more info, you have it here