You can already uninstall some apps in this way today.
This feature was just added in build 18262 of the Windows Insider preview, available today for Windows Insiders in the fast ring. Don’t want 3D Viewer, Groove Music, or Paint 3D? Uninstall them! Windows 10’s next update, codenamed 19H1 and due for release sometime around April 2019, will let you uninstall more of Windows 10’s built-in apps with a few clicks.