My maple planks from Lowe's were ready to go right out of the truck. I put them in the same day and they've been fine for two years now. Sometimes letting wood sit just slows down the job for no good reason.
Read on a woodworking blog that maple from big box stores is often kiln-dried to lower moisture content. It might seem stable, but indoor humidity can still cause movement over time. Two years isn't that long for wood floors. I'd still give it a week to settle, but hey, what do I know.