I don't use Pocket CU, but it looks similar to the apps of the other convenience stores here. It lets you browse what's available, ask some specific products to be ordered for delivery in your local branch, track packages you send through the convenience store postal service, etc... They usually don't do home-delivery though, unlike Doordash, as far as I know. Convenience stores are huge and everywhere in SK, with a few conglomerates controlling the whole market (CU, GS25 and 7-Eleven).