Windows Message Center:
Windows 11, version 23H2, also known as the Windows 11 2023 Update, is now broadly available to all users with eligible devices who Check for updates. In addition to annual updates, devices running version 23H2 receive new features and enhancements more frequently using servicing technology.
Eligible Windows 11 Home and Pro devices that are not managed by IT departments will be automatically updated to version 23H2 when they reach, or approach, end of servicing.
If you have an eligible Windows 10 Home or Pro consumer device, you can easily update to version Windows 11, version 23H2. Open Settings > Windows Update and select Check for updates. If the update is available for your device, you will see the option to Download and install. For more details, watch this video.
NOTE: Timing of features delivery and availability varies by market and device.
Source:

Windows 11, version 23H2 known issues and notifications
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