q about copyright

Hi all, I copyrighted my book about four months ago and I STILL haven’t got a confirmation it has been approved after paying for it. I am wondering if I should go ahead and copyright the rest of the books - or wait until I get the answer back. Is this a typical timeframe? It will end up being a lot of money which I can spend elsewhere. Should I also be copyrighting the audiobooks? Thanks for your responses in advance!