So far, there have been 37 indictments. I haven't looked at this website in a while but it has a timeline of everything that's happened.

https://themoscowproject.org/collusion-timeline/


-Trump National Security Advisor, Michael Flynn, was indicted and became a cooperator in order to avoid jail time. He has apparently been a great help to the investigation.

-Trump Campaign manager, Paul Manfort is in prison. He will most likely die there, I think he gets sentenced today.

-Rick Gates, who worked for Trump's campaign also, pleaded guilty to Conspiracy against the United States. He is cooperating.

-Trump's personal lawyer, Michael Cohen, pleaded guilty, cooperated and was sentenced to 3 years in prison.

-Trump campaign advisor, George Papadopoulos, pleaded guilty to lying to the FBI.

-Trump's friend and campaign advisor, Roger Stone, has been charged with obstruction, false statements, and witness tampering. He was in contact with Wikileaks, a front for Russian intelligence, about Hillary Clinton's stolen emails. Don Jr was also in touch with Wikileaks.

The Trump Tower meeting happened.
https://www.cnn.com/2018/07/31/politics/trump-tower-meeting-timeline/index.html

The Southern District of New York is also investigating Trump.
https://www.theguardian.com/us-news/2019/feb/09/new-york-southern-district-donald-trump-inauguration-prosecutors

Trump Organization CFO is cooperating and has been granted immunity
https://www.politico.com/story/2018/08/24/trump-organization-allen-weisselberg-immunity-795496

Deutsche Bank, who loaned Trump money when no one else would, was raided.
https://www.cnn.com/2018/11/29/business/deutsche-bank-police-raid/index.html

This too.
https://thehill.com/homenews/administration/418928-federal-agents-raid-office-of-tax-firm-that-previously-worked-for

and this.

https://www.businessinsider.com/jared-kushner-russia-back-channel-testimony-2017-7

Don't forget Maria Butina, Carter Page, George Nader, Erik Prince, and pretty much everyone around Trump having Russian contacts and lying about it. It's not just Russia though.
https://www.thedailybeast.com/get-ready-for-muellers-phase-two-the-middle-east-connection

The firing of James Comey and Andrew McCabe and Trump's changing stories for why. Also, constant obstruction of justice on twitter.

CNN's breakdown of the investigation.
https://www.cnn.com/interactive/2017/politics/russia-investigations/#/

Apparently Schiff will be calling Felix Sater to testify, keep an eye out for that name.
https://www.nbcnews.com/politics/donald-trump/trump-associate-felix-sater-sued-mariah-carey-s-former-manager-n979061

Twitter is buzzing that Mueller is going to drop some fresh, hot indictments tomorrow. We shall see.