MacRumors published a story that Apple has released the third betas of iOS 17 and iPadOS 17 to registered developers.

Apple Seeds Third Betas of iOS 17 and iPadOS 17 to Developers

Apple today seeded the third betas of upcoming iOS 17 and iPadOS 17 updates to developers for testing purposes, with the software coming two weeks after the release of the second betas.

Registered developers are able to opt into the betas by opening up the Settings app, going to the Software Update section, tapping on the "Beta Updates" option, and toggling on the iOS 16 Developer Beta. Note that an Apple ID associated with a developer account is required to download and install the beta.

Apple Seeds Third Betas of iOS 17 and iPadOS 17 to Developers