Yellow and gray top is done, but do I have quilting thread?

I didn't get any yard work done last evening - it was a bit warm, I was a bit tired, and I had some stuff to do inside. I did get the quilt top done! It is 80" x 96". Those are 16" blocks not including seam allowances.

I went hunting in my quilting thread stash to see if I have all the colors I need to quilt this top and I don't. I have a good variety of yellows from light to dark, but I am sorely lacking in the darker grays. I will have to do some shopping for thread as I need to get this done by June 15th for when Peg comes to visit.