Xbox 360 "In Transit" (???)?

Hello, I recently sent my xbox back to microsoft for the infamous trap known as the RROD (or red ring of death for those of you who have the time to say the whole thing.) I sent it 10/10/09 and it was shipped to Mesquite, TX that day miraculously. Well i checked my shipping status on the xbox service site and it said "10/19/09 1:55:00 PM___In Transit To_______Phoenix AZ" I live in Gilbert AZ wich is a neighbor to Phoenix. It is now 3:05 PM, i was wondering if i would get my xbox today, tomorrow, or the day after? what does in transit mean too??