Congrats on everything so far! I'm also going through the same process, i-140/i-601a. Just submitted the i-601a petition a couple months ago.

Unfortunately I don't have much advice to give as I'm also hoping to apply for AP as well. I'm almost wondering what's the right time to apply for AP. Could you have done it earlier? Or did you have to wait for the i-601a waiver to get approved before you applied for AP?

Do you have an attorney that is filing these forms for you? I'm assuming they can tell you what questions to expect. My attorney has told me that they will help me through the process and they have been very helpful in answering my questions.