I'd leave them for now unless they are in a warm greenhouse/conservatory. Later on when the weather warms up you can take the top few inches as another cutting and let it bush out.

If they are where it is warm, I would pinch the growing tips out, then they will bush more from the bottom.

Thank you for the advice. I will pinch them out as they are indoors where I pamper all my cuttings over the winter.