You would have to call the stores and see what they have in inventory.
Example: checking Apple's website for an iMac 27" i7, 1TB Fusion, 680MX shows a ship time to pick it up at the store.
Yet when I went to the store they told me they had 3 of those confirmed sitting in the back ready to go home with me.
I found the loaded 13" i7/8/512 in Toronto Eaton's centre on Thursday. I returned it yesterday (still sealed) though. Decided to wait a while longer as I'm not ready to switch from a desktop (windows) just yet.