In my opinion, you can not know who is dealing with your MS before the decision letter is finalized. Perhaps you can directly send email to Editorial office.
Thank you upstair for you kind assistance. There are six ediitors. I don't know who is the handling editor of my paper since the elesivier system did not notify. I would like to ask editor directly for the progress of my paper. Anyway I will wait until 4 months (now 3 months and 6 days).