You don't need to worry about the 'uploading tracking within your handling time' metric unless you want your listings to qualify for the trs plus badge on .com. It isn't needed to be a global top rated seller.
As another poster mentioned, it's possible to receive a late shipment ding if you don't have a tracking scan within your handling time or a delivery scan by the estimated delivery date. However, if you don't have tracking, you don't get dinged for late shipment unless a buyer checks off that the item is late when they are entering feedback for the transaction. In my experience, few buyers ever check off that an item was late.
Each seller has different risk tolerances so while some Canadians almost always use tracking, there are many that don't use it.
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