As of 16th of July  2019,
Windows 10 version 1903 on public release, make sure your backup is up to date before updating windows.
Version numbers run from 1703, 1709, 1803, 1809 to 1903.

To check your version press the windows button +R then type winver and click OK to run the command and you will see your version in “About windows ”
Windows 10 release information page.

From Microsoft
“Update for customers with devices that are at or nearing end of service and have not yet updated their device. Keeping these devices both supported and receiving monthly updates is critical to device security and ecosystem health. Based on the large number of devices running the April 2018 Update, that will reach the end of 18 months of service on November 12, 2019, we are starting the update process now for Home and Pro editions to help ensure adequate time for a smooth update process.”

IT News