The perpetually licensed version of the desktop Office apps, branded Office 2019, was released today. It’s available as a one-time purchase for volume-licensed commercial customers. A consumer release will come in the next few weeks.
Office 2019 is supported on Windows 10—exclusively; no Windows 7 or Windows 8.1 support is available—and the three most-recent versions of macOS (that is, today’s release of 10.14, 10.13, and 10.12).