1. Using the lightning network, transactions will confirm instantly.
2. Generating the transaction on the phone and sending the hash to the terminal which is confirmed
This will take less than 3 seconds.
Then the terminal broadcasts the TX.
Sorry, as my rank says, i'm a newbie. What is the lightning network???
The lightning network is a new upcoming update to the network that will allow transactions to certain people that you specifically set to instantly be confirmed. So the transaction will not only be instant, but the first confirmation will be too. I'm not too familiar with the system, though.