I have submitted my mathematical paper to a journal in November 2018. After that, it has the status "Awaiting Referee Selection" during 4 months. I contacted the Editor-in-Chief for his support, luckily, he is very nice. The result is that the status of the paper has been "under review" in March 2019 and he said that:     I hope to receive the reports of the referees by mid-April.   However, today (April 24, 2019) I still has not received the first decision.  Should I contact the Editor-in-Chief again or not? Thank you for your comments.
What steps does a manuscript typically go through from submission to publication (or rejection) in a typical journal? How are these steps referred to, in particular by editorial systems, and how long do they each typically take?  Note that this question is about the typical situation and hence not about:   Journals with an atypical workflow, e.g. those that allow for an instantaneous reviewer–author interaction. Exceptional steps or rare occurrences such as withdrawal or .   This is a canonical question on this topic as per . Due to its nature, it is rather broad and not exemplary for a regular question on this site. Please feel free to improve this question.
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