I went down this same path my friend. The sexing at the hatchery’s are pretty accurate. If the local feed store was selling the birds as pullets, highly likely you have a pullet.
My GLW and SLW have been the best! They are firing away on all cylinders (I have a Copper Maran too explaining the darker egg).
Below is my setup and run free on pasture during the day on 2 acres. Have 16 meat birds in the brooder right now and 1/2 will be ready to go on pasture next week.
Best of luck to ya and keep us updated.