APPLE INSIDER
Rounding out its set of betas for the milestone operating systems, Apple has provided developers with a fourth build of macOS Big Sur for testing.
The latest betas and configuration profiles can be downloaded from the Apple Developer Center, with subsequent changes available as over-the-air updates on enrolled devices.Apple has already released betas for the other four operating systems of this generation, with iPadOS 14 and iOS 14 surfacing first on Tuesday before a secondary release for tvOS 14 and watchOS 7.
Source: APPLE INSIDER