It can take up to a week or so for your first DistroKid upload to go live in all stores. (For more information about the time it takes for releases to go live to stores, please check out the FAQ article, here)
Even after your release has gone live, it may require some additional processing time before DistroKid detects your release(s) in stores. If you're trying to get your Spotify artist page verified and you see a message saying that your release has not yet been detected, please try again later.