Microsoft started rolling out Windows 11 to more Windows 10 eligible devices as of now.

The first wave of people receiving Windows 11 was on Oct 5, 2021. The availability of Windows 11 has increased, causing more and more people to see a notification in the Windows 10 update panel they are eligible for the Windows 11 update.

This process will continue into next year.

Microsoft: The availability of Windows 11 has been increased, and we are leveraging our latest generation machine learning model to offer the upgrade to an expanded set of eligible devices. We recommend that you upgrade your devices to Windows 11 to take advantage of the latest features and advanced protection from security threats. We will continue to train our machine learning model throughout the phased rollout to deliver a smooth upgrade experience. Furthermore, we will also provide status updates as we further increase availability over time.

If you are using Windows 10, you can determine if your device is eligible for the upgrade using the PC Health Check app or checking Windows 11 specs, features, and computer requirements. If you have an eligible device, open Windows Update Settings and select Check for updates. Once the upgrade is ready for your device, you will see the option to download and install.
For more information on the Windows 11 upgrade experience, watch this video.
    • Source: Microsoft