This date has not been confirmed until a few hours ago by the Cupertino company itself. In this case Apple says that next Friday, May 21, it will have stock in its stores of these new 24-inch iMac along with the new iPad Pro and Apple TV 4K.
The date of May 21 was postulated as the arrival date of those users who bought the iMac as soon as they presented themselves and also as the date of launch or arrival at the official Apple stores, but it has not been until now that it has not been officially confirmed.
The stock will depend on demand and other external factors
Just because they have the equipment in Apple stores around the world does not mean that they have all the colors available, all the models, etc. in this sense It will depend on external factors that all the available models have this friday
As with the new iPad Pro, the 24-inch iMac They have had a great acceptance so it is possible that they suffer delays in the arrival to the stores although the official date is next Friday.
On the other hand, users who have scheduled delivery dates for May 21 are most likely to be confirmed and have no further delay. If you are thinking of buying one of these new 24-inch iMac do not hesitate to visit an Apple store the same Friday, what is certain is that you can see them exposed.