I sent an email to them, here its in short
[All Application Details]
Dear Sir/ Madam,
This is request to check the status of my application and wanted to clarify on outstanding document.
We did not send our Singapore COC and expecting a query, We do have COC now based on AOR please suggest next step.
CIC replied next day that
Good Day,
Please note that your application is currently in queue for review by an officer which explains why you haven't received any correspondence from our office.
We do not require any information from you at the present time. An officer will contact you if further information is required. Please ensure when submitting documents that they are still valid and will not expire within 6 months as this could delay your application.
We appreciate your patience and ask that you keep correspondence with our office to a minimum. In order to process requests efficiently, we will not be responding to duplicate requests.
Regards,
Case Processing Centre
xxxxxxx all Signature details