The definition of eBay's timely delivery rate refers to the proportion of orders that sellers are able to process and ship in a timely manner within the specified time. Specifically, the standard requirement is that sellers must at least ship the order and provide valid tracking information within the specified delivery time. If sellers fail to meet this standard, it will affect their reputation and ranking on the eBay platform.

Therefore, sellers need to process orders as quickly as possible to ensure timely shipment and provide tracking information, thereby improving their timely delivery rate.