UPS “We're updating plans for your package”: what it means
“We're updating plans for your package” means UPS is working out a new delivery date, usually after a delay or a missed connection.
Why the date disappeared
UPS removes the old estimate while it reroutes the package or waits for space on the next truck. It's common at busy hubs in November and December.
How long it lasts
Typically a day or two before a new date appears. The package is usually still moving.
When to do something
If there's no new date or scan after three business days, contact the sender. They're UPS's customer, so they can open an investigation.
Other messages: every common tracking status, A to Z.