Honestly, that depends on the seller.
I have purchased one item from Etsy and received exactly what was pictures, in the exact time frame that was stated.
If You are unsure, check the reviews for the store. People can only review an item after purchasing, so the reviews are usually a pretty good indication.
And, if you are still unsure, you can message the seller and ask for a picture of the item different from the picture featured for a different angle, or ask for further details. If they deny you such, then it's probably best to stay away from the seller.
Generally, reliable sellers Will have their shipping info included somewhere either on their page or the items page, letting you in on their schedule and preceduces.

Most of the reviews above come from negative seller experience. Etsy itself is a host for the stores, so as long as you find a reliable seller, you should be ok.