neowin[.]net/news/microsoft-starts-force-upgrading-users-on-windows-10-1903-to-1909
If you're still running Win10 v. 1903, it's That time. Microsoft's only bumping the version up to 1909, which means just a cumulative update, rather than a full install, but you might want to go ahead with that full install anyway, since they'll just force another update, this time a full install, in a few months.
