It could still be with them and awaiting pick up, you often have airway bills available on you to prepare shipments so you have tracking numbers there and then, if they sent you tracking at 8am, then pickup might be 5pm, so no info might show until its actually picked up and scanned into their system.
Give it until tomorrow, if nothing then I would enquire. UPS, DHL, FedEx have high quality tracking systems which are pretty much instant so doubt it would take 3 whole business days to show info.
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Kelvin MacKenzie is a ****!
Justice for the 96! YNWA