Do ebay items suppose to have tracking number when shipped?

I ordered an iphone and it doesn't have a tracking number not even listed as shipped but the seller said it would be arriving today or tomorrow at the latest

You need to file a dispute against this seller for not providing you with a valid tracking number as never received, he probably didn't even send it and you have to file before the 45th day after the sale i personally wait 14 days then file for a refund.