Yours should clear...Although Pre-New year scene could see rush its fine & also due to Surge pricing this is one of most effected Rajdhani, you can still see 2AC CNF berths available now also from NZM on Dec 29th.
.
If you want CNF right away i would suggest to book from NZM with BPL as BP rather than depending on Tatkal...Check out if this is feasible for you.