Congrate Perry! That ootheca is slightly less than 2 inches which is the average ootheca size, it will still give you a good hatch rate of 50+ nymphs. All the best. Now it is just the wait, but it shouldn't take very long due to the Summer heat.
Get two ff cultures ready just in case, i'm in need of ff right now actually after some ootheca hatched out sooner than I thought and caught me off guard. :?