Microsoft announced the rollout of the Windows 11 operating system to the eligible devices running supported hardware configuration. This rollout begins one day ahead of the previous rollout plan, which was supposed to happen on October 5th.
If you are running Windows 10, you can check to see if your device is eligible to upgrade using the PC Health Check app. You can then check to see if the Windows 11 upgrade is ready for your specific device by opening Windows Update settings.