Apple could only be a few months away from releasing a 2022 update in the iMac series. Supposedly, Apple will sell the all-in-one desktop as the iMac Pro, which will be available with M1 Pro and M1 Max chipsets. The 24-inch's design will return in the iMac Pro, too.
https://www.notebookcheck.net/iMac-2022-to-launch-as-the-iMac-Pro-with-Apple-M1-Pro-and-M1-Max-chipsets.596872.0.html