Just to be clear you should only mention permanent resident status. Claiming to be a citizen before the oath ceremony anywhere could result in your application being denied.
Also, theres no such status as "awaiting to be a citizen" ( for e.g., there is such a thing as "I-485 period of authorized stay" for GC applicants) - either you are a citizen or you are not. Recommend you state you are a GC holder, and add an addendum stating you expect to gain citizenship in the next x months.