Capped brood and what's either larvae about to be capped or pupae being removed. Lots of backfilled nectar. Open queen cell.
What did this cell look like when you did the cutout? If it was closed, sit back and wait. You have a queen, but she will take up to 4 weeks to begin laying.
If it was open already and this was the only queen cell you got, you may not have gotten a queen with your cutout. You could have missed her under the mobile home, or she might have swarmed before you got there, and maybe the virgin was let behind or out flying.....or any number of other possibilities.
Either way, if you have another hive that is doing well, give this hive a bar with eggs. If they have a queen, they will just raise them. If they do not have a queen, they will build queen cells.
If you want to buy a queen instead of raising one, you can go ahead and do that now. But you should put some thought into what you'll do if you later find you had a queen all along.