So, the file gets transferred once the sponsor side is confirmed. Once that happens, the biometric and medical request happens. After this/ during this the file is transferred to visa office for final processing and background of the applicant.
I am a March 22nd applicant. Mine transferred on July 6th. They requested more photos a week later. I sent them as well. Nothing after that. But usually they transfer if they are busy or require more evidence. Sometimes they wrap it up in Canada itself. So that might be your case