You ask Sunny Smiles when the delivery is due.

Sunny Smiles: "The sooner, the better. Roseforge is a good pony, but she can be a little impatient sometimes."

Moonflower: "Ooh! Why don't I do it? You've been pullin' the cart all the way here, so I could fly this back to her! S'only fair, right? I'll come back with the bits and everythin'!"