Hmmm, okay. If it would be the case it could give place to a nice feature easily, to boost into the future.
Usually when a note is posted, it is right away boosted or not, so it does not show the note to a different circle than the one who can see it when it was posted. So it would be good, if we could schedule boosts to future.
If clients does not show notes from future, then this is an easy task. Just post it with future timestamp when you want to see it. So this way you might give bigger reach to a note you boost.