It's happening a little later in the season than usual, but Apple's latest version of macOS is available to download today. Catalina arrives on the heels of iOS 13, which saw several back-to-back updates after an initially rough launch. For what it's worth, I've been using successive versions of the Catalina beta as my daily driver for months now and can assure you that the latest build is stable enough to safely install.
Engadget will publish a full review of the software soon. The reason we're waiting: A couple of key features won't be available to try out until the finished OS ships today. That includes so-called Catalyst apps that were designed for the iPad first and later ported over to the Mac. Some big-name cross-overs you'll be able to download at launch: Twitter, TripIt, Rosetta Stone, Post-It and the game Asphalt 9, among others.
Speaking of games, today also marks the first time that Catalina beta users will have been able to play Apple Arcade games. If you're wondering how the heck you'll play those titles from your Mac, it's worth a reminder that many Arcade games support Xbox and PlayStation controllers.