Congrats on the lock.
There is no telling when a female will ovulate, unless you are super good at feeling for follicles or have an ultrasound machine then you might be able to guess. Unless she is clearly near ovy now I highly doubt she will lay in December. Mine didn't lay until May/June this year and I started pairing that the end of October.
You will learn patience waiting for this clutch and from breeding in general.