Queen returns from mating flight and walks in

I had just done an inspection on this hive 2 hours previously and it actually was given a Queen cell when it was made 3 weeks ago. As I was walking to put all my tools away I saw the swarm in the air and watched to see what was going on and realized as they returned to that Box it was a mating flight for this Queen. She is ssfe and sound back in her hive. We are only about 4 days into our golden rod fall flow with 4 to 8 weeks until our first frost. It is going to be close on build up for winter survival, but they should be able to.