https://techcrunch.com/2020/11/12/macos-big-sur-is-now-available/

The day has finally arrived. The latest version of macOS is here, after a seemingly endless wait. That wasn’t just your imagination, either. Sure time is basically meaningless now, but this one did take a while to arrive, with nearly five months between its announcement at WWDC and today’s public release.

There are, no doubt, plenty of reasons for this. Among other things, this has been an usual year, to put it as benignly as possible. This also marks a pretty big annual update for the desktop operating system. And then, of course, there’s the fact that this is the first version of macOS expressly built for the company’s new Arm-based Macs — the single largest change to Apple hardware in roughly 14 years.