Honestly, 2 months isn't really a lot of time for a coral to grow.
Granted, there are some people who have great luck with lots of coral growth in a short period of time... but some people just have to way longer.
Hammers are slow growers in the first place, so you probably won't see a lot of growth there.
Open brains are also slow growers.
The best way to notice growth is with pictures. Take pics NOW and in a month, go back and look at them. You probably will see some growth.
Since corals grow rather slowly, we can't see the differences from day to day. taking monthly pictures gives us a good idea of what's growing fast in our tanks, and what's growing slowly.