If you have been ignoring the “updates available” notification on your Mac recently you may not be aware that Xcode 12.3 is now available from Apple.
This new version of Xcode includes the SDKs for iOS 14.3, iOS 14.3, iPadOS 14.3, tvOS 14.3, watchOS 7.2, and macOS Big Sur 11.1 in addition to minor bug fixes.
Full details of this new release can be found at:
https://developer.apple.com/documentation/xcode-release-notes/xcode-12_3-release-notes/