I think in the end his findings will be dumped in the lap of congress. I can't imagine that they would be released publicly though someone will eventually leak them. I'd expect that at the end Mueller would have a press release with essentially a summary of the findings and his recommended courses of actions to congress.
Mueller's taking such a long time and proceeding so apparently methodically and with minimum leaks means he's undoubtedly trying to make an air-tight case for any conclusions he comes to. Whatever his findings need to be so clear cut and provable in court that only the most partisan would contest them as a politically driven hit.
There's a possibly that the Republicans would start an impeachment trial and find the president not guilty in order to prevent his being tried by the Democrats in the event of a blow out loss during the mid-term elections. Other possibility is they just sit on it and use it as leverage against him in a "you support this bill or we might have to head the clamoring of the Democrats and have an impeachment trial"
That's assuming that this is concluded before November. If it's only concluded shortly before the elections and the Democrats grab the majority in one or both houses there's a good chance of an impeachment trial no matter what the results of the investigation. Whether Trump is removed from office or not wouldn't matter much to the Republicans because either way it would fire up their base against the deep-state, liberals, socialists, progressives, and globalists that are the ire of their world view and allow them to use it for propaganda and try to regain those seats in 2020. Pence would work alongside their agenda much more easily but he is nowhere near the lightening rod for anger and protest as Trump is which allows so many 'small cuts' to go unnoticed by the news while we focus on Trump's latest outrage.
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