He doesn't need congress's approval, and I'm just guessing that he doesn't see manipulating congress -- beyond repelling their attempts to shut down the investigation and impede justice -- as part of his job.
We, the electorate, are the ones who could force the Republicans controlling congress to act by our response to what the investigation reveals.
He does need his boss's approval to indict a president, and then that would be taken to the courts to determine if a president can be indicted (Ken Starr felt he could, but Mueller now has less power by law). Big hole in the law here. Aside from that little detail, other steps such as impeachment, trial, and removal would be congress's job. And likely the courts'.
If charges were in order against Trump, it's very possible that at this point or possibly before congress would negotiate an agreement between parties on how to proceed, such as letting him resign as Nixon did. They don't even have to show us the report Mueller submitted to his boss.
Again, though, this would be a political power decision, with national support or lack of it a very huge factor.
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