The once is a response. Time related. When are you coming over?
Now the once. When are we leaving?
Now the once. Meaning shortly, within the next few minutes. Now, and now the once, are very close together, but they are not the same thing. Now is… is present, it is current, it is in the moment. Now the once is… it is coming, it will happen, you can see it, but it’s not here. It’s not the same as in a minute, because in a minute could be structured. You could be speaking about an actual minute. Now the once is fluid, it’s not a definitive, structured unit of time, but it is happening very soon.