I don't think he will be "exonerated," but at the most, he will face fines for campaign finance violations even though those related charges are past the statute of limitations.
Candidates often violate campaign finance rules, but the vast majority of the time, they are fined by the Federal Elections Commission. When the FEC looked at these violations (after Cohen pleaded), they publicly stated they would not be fining Trump. You can download and read that letter here.
If the FEC opted not to pursue the violations, I don't think Bragg has a good chance of obtaining any felony conviction, and I'd be willing to bet the FEC will be called to testify as to why they didn't pursue the matter.
The only thing (JMOO) that might change the outcome would be the inclusion of charges we know nothing about so far.