I tried to lay stones on the top of the cement wall, but I don't think I have enough skill to do this the entire way.
So I should probably hire someone to do a good job.
But I can go ahead and buy the rock and have it ready. 8x4 limestone blocks. 620 pounds for a total cost of $42.89.
That is not quite enough, but it is as much as I could get in the car. I need another 10 feet or so, but I also need to finish the wall to the street before getting this done.