Plant it now.

The old rules of plant in the fall were mostly for way back when you usually bought bushes and trees while they were dormant (often b&b, roots wrapped in burlap). Nowadays you can buy most things growing in containers and actively growing. Container grown plants can be planted at any time you can dig in the soil.

Or, you can do it my way and leave it in the pot on the ground to plant itself,LOL. I have 4 purples and 2 whites growing happily in their pots where I placed them. They have not only survived but thrived both the wet winters and the two beastly summer droughts.