Updates are sent out through Carriers. Once The update is ready through Samsung, Samsung will send the update out to your carrier. Then your carrier will make the small changes that it needs to. Once your carrier is ready, they will send out the update in waves to multiple devices at a time. You can always try restarting your device to see if the update shows up in your settings. You can always also reach out to your carrier and see if they have a timeframe as to when they will be sending out the update. I hope this helps!
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Firmware / software updates like this get rolled out in phases and depend on the phone version, lock status, etc. Some devices get updates monthly, some quarterly: https://security.samsungmobile.com/workScope.smsb
Rebooting your device might help show an update, or booting into safe mode if there is a third party app issue stopping that. If you have a carrier specific device you also might reach out to their support team for an possible updates on timing and more info.
Security updates typically happen early in the month but aren't guaranteed by a certain date, after all, testing and verifying quality may take more time if an issue is found.
Since no one wants bugs in their software updates, I'd encourage you to keep checking and be patient for updates like this.
Want to check for updates now? https://www.samsung.com/us/support/answer/ANS00077582/