I know it's hard to stay detached. It does sound like you are doing it well.
I'm sure he wants to know whether you are going to sign, and it will be difficult to put him off until monday without telling him about the lawyer. I guess you can just say, "you took 8 months, you can give me 8 days, ok?"
I was about to suggest that you mail that cell phone to him, but that won't really help anything. You will need to be in touch with him until the D is final, or at least the papers are signed and filed. Better that you use that phone for now.