I don’t think that’ll happen. Cohen is a scumbag. A traitor to Trump.
IF he does plead guilty = no trial, then he likely will get either immunity or a suspended sentence.
In exchange for damaging dirt (true or not) on President Trump.
Cohen was mainly involved in payoffs to porn stars, not any meetings with Russians. He was not even invited to the meeting in Trump Tower with Don Jr.
Still no evidence of Russia collusion by Trump campaign after 2 years of investigation by angry democrats on Mueller team..