Apparently, CCC 5.1.23 is not a beta any longer, despite the headline at Yes, you can have bootable backups on macOS Big Sur. When I launched CCC and checked for updates, this new version was listed as available and no mention was made of a beta.

Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365