I have sent CSE on 17th February and got reply today as follows:
Dear Sir,
Thank you for your enquiry to the Immigration Section of the High Commission of Canada in Singapore.
An Acknowledgement of Receipt letter was sent to you after your application was received by our office. Your application is currently in a queue awaiting initial review.
Unless we have specifically asked you to do so, you are not required to submit any documentation at this time. Our office will contact you to provide the required supporting documentation for the assessment of your application.
Applications in the Skilled Worker category are processed in order of receipt. Your application forms and fees guarantee your place in the processing queue. Your file is being processed in accordance with its place in the queue, based on the date on which the application and fee payment were received in our office. As we are not yet ready to review your file, you are not required send any documents in support of your application. Since your application is still within normal processing times, we are not able to provide any status updates on your file. When we are ready to review your file, we will send a document request letter to you using the contact information we have on your file. That letter will list all documents required to continue processing your application.