Try late morning or mid-afternoon. I've called about 4 times. The longest wait I had was about 5 minutes, but other than that I had ZERO wait. The last time I called was yesterday.
I honestly don't think you'll have any problems making reservations. I didn't start making reservations until about 65 days out, and I've had ZERO problems getting exactly what I wanted within about 20 minutes of the times I requested.
Good luck and breathe easy.