Most of our patients are for the most part fully grown in at 6 months. There maybe subtle changes between 6 months and one year. Although the frontal area/hairline looks quite thin, at 9 months post-op you are for the most part fully grown in. If you have photos showing your scalp immediately after the procedure then a determination of graft survival rate can be made.
At 9 months you're probably very close to full growth. There's a chance you'll see significant improvement over the next few months, but in reality any changes you'll see will probably be minor. Now is the time to be talking to your surgeon about what your goals were and how/why they weren't meant, and what you can do in the future to actually achieve them.