why does my mac don't receive latest update after I rebooted it
What can i do when I don't receive latest update
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Did you try to search for an update in the macOS AppStore?
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If you don't see Software Update
If you don't see an item named Software Update, choose View > Software Update from the menu bar in System Settings or System Preferences. Or use Search in the corner of the window to search for Software Update.
If your older Mac doesn't include Software Update, open the App Store app instead. It's in your Applications folder. Then click the Updates tab in the App Store to check for updates. You can also search for software by name.
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copied from: Update macOS on Mac - Apple Support
Which Mac model do you have?
If your Mac meets the hardware requirements, follow the steps mentioned in this article, after you opened it in Safari: