Problem on mac os update

macOS 27 Golden Gate was released September 14, and both the M1 MacBook Air (2020) and M1 MacBook Pro (2020) are compatible.

I’d first check  > System Settings > General > Software Update. If it still doesn’t appear, restart the Mac and check again.

One thing I noticed: your post says MacBook Air, but the device listed is a MacBook Pro (M1, 2020). Either model should get the update.

Before upgrading, make sure you have a current backup.

Apple’s upgrade information: How to upgrade to macOS 27 Golden Gate - Apple Support

If your MacBook Air is the M1 (2020) model, Apple lists it as compatible with macOS 27 Golden Gate, which was released on September 14, 2026. Apple — macOS 27 compatibility

First, confirm the Mac model and the macOS version currently installed by going to Apple menu  > About This Mac. Before upgrading, Apple recommends backing up your Mac.

Then go to Apple menu  > System Settings > General > Software Update and check for updates. Software Update checks whether macOS 27 is available for your Mac. Apple — How to upgrade to macOS 27

If macOS 27 does not appear, open Terminal and run:

softwareupdate --list-full-installers

This shows the full macOS installers currently available for your Mac. If macOS 27.0 is listed, Apple documents downloading the full installer with:

softwareupdate --fetch-full-installer --full-installer-version 27.0

If you post the complete output of softwareupdate --list-full-installers, together with the macOS version shown in About This Mac, there will be more information available to determine what macOS versions Apple is currently making available to that Mac.

Apple — How to download and install macOS