The Supreme Court ruled that New York State is allowed to subpoena the conman's tax returns.

They might eventually provide evidence of some sort of fraud which could be used to prosecute him, but I don't expect them to have great political impact, because it has taken too long (almost four years).

In 2016, he chose his tax returns as an example to show contempt for our political system. When that didn't cause Republicans to reject him, he moved on to spit on other things far more important. This year he has fired inspectors general, turned environmental regulations and financial regulations into nonsense, packed the US courts with right-wing extremists, and ordered soldiers to attack peaceful protesters. Will showing we got his tax returns disappoint his supporters? I doubt it.