Telegram say this option in useless because the telegram can run on multi devices, but we want to know if the message delivered to one at least of destination devices. Noting that this option exist on many other chatting apps works on many devices like Facebook messenger.
That's true, we don't have an additional status for 'message delivered to device', because you can use Telegram on multiple devices simultaneously. Since you don't know which one of their devices the person is actually using, delivery to one of the devices becomes irrelevant.
I don't want to know which user device deliver the message I only need to know if it is delivered to one of it's devices at least. I think it is same as when user read the message they can read it on any of it's devices.
And it will be more helper if there was a message details to see the first time message deliverd and read.