I'm not a constitutional scholar like everyone else here (as well as everyone being experts in theoretical physics, small-engine repair, psychology, and needlepoint), but I know a little:
A sitting president is not amenable to indictment of criminal prosecution, as it would undermine his/her ability to perform the duties of the Executive Branch.
Trump is no longer the president, and this is a criminal investigation of a suspected criminal. The right-wing crazies here are calling it a victory because it's taking so long; guess what, this is America, and justice takes a really long time, especially when investigating and prosecuting people with money.
I'm not interested in the fact that his tax returns are going to show he's not worth anything close to his boasts. I'm interested in him being prosecuted for conspiring to overturn the election, and I'm interested in him being prosecuted for surreptitiously thieving classified documents that were property of the United States. I'm also interested in the parties he allowed to examine those documents.
It's going to be a long while before any of this is over, and it is possible that it won't be completed by the time his life comes to an end. I won't be completely satisfied if that's the case, but I'll take it. It's obvious he's guilty of multiple crimes and whether he's brought to justice or not, he and his supporters will spend the rest of his life being jeered.