MacRumors published a story that Apple has released the third beta of macOS 12 Monterey to registered developers.
Apple Seeds Third Beta of macOS 12 Monterey to Developers
Apple today seeded the third developer beta of macOS Monterey, the newest version of the macOS operating system. The third beta comes nearly three weeks after Apple released the second macOS Monterey beta.
Apple Seeds Third Beta of macOS 12 Monterey to Developers
Registered developers can download the beta through the Apple Developer Center and once the appropriate profile is installed, betas will be available through the Software Update mechanism in System Preferences.