Welcome to the Wefugees community and sorry for the longer waiting time!
I've had a look and found this very similar question on our platform:
How long does it take for Berlin Ausländerbehörde to process for family reunion visa when they receive it?
Our asylum law expert Nilab answered the question on that thread, please scroll down to find it.
As it looks like, it's hard to say how long the process takes, a longer waiting time doesn't seem unusual and highly depends on the country where you applied for family reunion.
It might be helpful to reach out to the embassy regarding the waiting time, to check they haven't forgotten about you.
Hopefully it doesn't take much longer. Please let us know if you need any further assistance.
All the best,