It is unclear what you mean by the “due date” in your question.  A project that does not have a signed interconnection agreement must provide a copy of the submitted interconnection application.  (There are additional requirements that apply to such projects including providing a list of required non-ministerial permits, documents to show site control, and letters of intent from lenders or equity partners to cover 30% of the financing for the project.  Please see the requirements in Section IV.4 of the RFP Rules).