I've recently been asked to be a reference for a previous colleague. The hiring manager of the said colleague mentioned that he will be reaching out to my colleague's referees shortly.
Its been a 3-4 business working days and I have not heard from the hiring manager. This colleague of mine has been an exemplary worker and I would really like to provide a good reference for him.
Is it OK for a reference to contact the hiring manager first and set up a call?