Our registrar, Orion Registrar of Arvada, Colorado, says they would like to see three months' use of the completed system and a complete round of internal audits. They would also want to see that the corrective action process is in use and that there has been at least one management meeting according to Management Responsibility.
I think most registrars use this as a sort of standard. As I look at my board right now, I don't see anything else that won't be used on a weekly basis. I think that's probably what they mean by requiring those things. Some companies might go three months without a corrective action, for example, but they want to see one anyway.
However, I would certainly talk to a registrar soon and explain your situation. Our registrar has scheduled document review for a date three months before our registration audit, and that might be an issue as far as scheduling to meet the deadline. Also, I'm sure registrars all take a different approach and want to see certain different things.