I apologize if this already exist, but i could not find it.

My question is, is there a real-time display next to the user question if that user is still on line or not.

Something like this (green circle) next to the OP info.

Having that information might help in posting comment and asking for information or clarification on the OP while the user is still active. Otherwise posting a comment might not be seen for long time, and it slows down the Answering significantly. Most OP ask a question and then after a while without comment or answer just walk away (been tired of waiting for a respond). I find it convoluted, when posting a comment like a hour later, then not getting a reply for days.