The best that happened today is that Comey confirmed there is an active investigation, which deflates the WH and GOP insistence of "fake news" regarding Trump/Russia. There is also the fact that he was able to comment on Trumps wiretap claims, effectively debunking them and getting Trump in deeper water for lying. There is also the clarification over Clappers previous comments regarding evidence of collusion, which the GOP tried to use to defuse the issue publicly in the past.
Not to mention that we got to hear multiple Democrats state facts regarding the Trump/Russia connections, regardless whether Comey could comment or not. Those facts matter, and having them heard is important.
Overall, it was a pretty good day for those who want the truth to come out.