What does arrived at hub mean for USPS?

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Tags

1. #particular
2. #delivery
3. #arrived
4. #local
5. #package
6. #refers
7. #sorting
8. #transit
9. #facility
10. #status
11. #normally
12. #route
13. #other
14. #where
15. #usually
16. #arrive
17. #driver
18. #packages
19. #sorted
20. #assigned