Generally the salary conversation is saved for the tail end of the interview process. (careerdigital.com)
You may ask about salary range only after several interview interactions And at the very end of an interview as a «curious» question. (job-interview-site.com)
Salary information, if not offered by the interviewer, should be requested only at the very end of the interview and only in a «curious» tone of voice. (job-interview-site.com)