We are on the same situation right now i have an ongoing RSMS 119 application, CO assigned asked me to get a COC here in Singapore but they didnt inform me also if my nomination was approved. I hope you continue to post here the outcome of your application.Anyway here is my time line (as far as i remember)
June 28 2012- lodged visa (with personal docs, ielts, nbi clearance(phils)
July 11 2012- Ack received - me my son and my wife took medical exam
Mar 26 2013- Singapore COC requested (ME and Spouse)
April 19- Release of our COC