I sent my last chapters to my "final reader" last night. Kemp is giving me one last round of feedback from the perspective of someone who has never seen any part of the novel before. He's already given me loads of excellent advice. So far he hasn't found any critical flaws--things what would need a major overhaul.
Today I'll start a final run through the book incorporating changes Kemp has recommended and fixing any bugs that I discover. I think this process will take about two weeks. After that it's agent query time.