Unable to track

i ordered a product that was supposed to be shipped on 8/17/2015. It made it to Opa Locka Florida at1:44am on 8/18. according to the tracking it has been sitting there since then. I paid for 2 day shipping so I should be getting it tomorrow. However, tracking has not been updated since 1:44am on 8/18. I loathe the USPS!