Microsoft today has officially taken the wraps off Windows 10 1903 and made it widely available. Those that want it right away can perform the “Check for Updates” procedure in the Windows 10 settings area.
Beginning today, the May 2019 Update is available for customers who would like to install the latest release. If you are ready to install the update, open your Windows Update settings (Settings > Update & Security > Windows Update) and select Check for updates. Once the update appears, you can select Download and install now. (Note: You may not see Download and install now on your device as we are slowly throttling up this availability, while we carefully monitor data and feedback). Once the download is complete and the update is ready to install, we’ll notify you so that you can pick the right time to finish the installation and reboot, ensuring the update does not disrupt you. This new ‘Download and install now’ capability is available for devices running Windows 10, version 1803 or version 1809 that also have the May 21st updates (or later) installed.
Microsoft also warns that the update delivered about this time last year (April 2018) is reaching end of service. For Home and Pro editions, end of service will hit on November 12, 2019. The company recommends installing the Windows 10 May 2019 Update by then.