I think it’s a good idea to launch an online shop with immediate delivery. The person who orders electronics /commodities/household items etc. has to expect delivery for a couple of days, as a rule, and even longer, while it is not that problematic to organize express delivery.
Actually, many refuse from the idea because logistics is badly developed in the company. It would be a great competitive edge for a store. Busy people do not like to wait for days and want to get the product as soon as possible.
In fact, many online stores offer such service, but you’ll see how problematic it is in reality when you start shopping. They claim that they do it, but few of them can cope with the task.
Prompt delivery without extra charge would help to attract the consumers and collect the customer base without effort.