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Available: The update is available for immediate installation.

images Scheduled to Install After: This is a required update, scheduled to install after the date and time specified in the status message.

images Past Due - Will Be Installed: This indicates that a required update is past its scheduled installation time. Updates are often in this status because of maintenance windows or failure to locate content.<...

From

Cover of System Center Configuration Manager Current Branch Unleashed, First Edition

Note

Update Installation Status in SW Center