rexandaya

My wife came to the US in Dec. of 2014 on K1. 
Married - Feb. 2015
Filled AOS/Green Card - March or April 2015
Interviewed - Sept. 2015
She moved out - Dec. 2015 ( we had issues(trust, jealousy, financial etc)
Green card was mailed to me - July 2016. ( There was mix up with the case, had to do with fingerprint + the lady that interviwed us left the uscis office)
We still live apart in the same state but meet up once in a while.

It's time for her to remove her condition and I think the best way is to get a divorce and have her file herself. I do not mind giving her a letter stating that we marriage was in good faith but things went south ASAP.

Is this the best route?

I got the following notice

On September 11, 2014, we mailed a notice requesting initial evidence in this case. Please follow the instructions on the notice to submit the evidence requested. Meanwhile, processing of this case is on hold until we either receive the evidence or the opportunity to submit it expires. Once you submit the evidence requested and a decision is made, you will be notified by mail. If you move while this case is pending, please use our Change of Address online tool to update your case with your new address or call our customer service center at 1-800-375-5283.

I thought it shouldn't take no more than 3 days for me to get the RFE but it's been 8 days. Is this normal or do I need to call USCIS?