Okay, well we will be watching for the prosecution put on by Mr. "Speedy-Pace." Oh that's right. His evidence all depends on how Trump behaves.
Mueller is investigating the entirety of the Russian and Trump campaign involvement. It is a “yuge” investigation. The fact that he has already cleaned out most over the lower level sympathizers shows he is moving at fast rate. No need for Trump’s behavior there.
Trump has the presidency of the United States hindering Mueller’s ability to approach him in anything similar to a traditional “subject” (Giuliani’s word, not mine). But, even the presidency or going “full legal” won’t prevent him from eventually having to answer for the obstruction allegations.