According to WaPo, Mueller has informed Trump's legal team he is “not currently a criminal target.” ...
What that means is that he very well could be, they're looking at him and they'd very much appreciate it if he would submit to an interview.
After which time, he would probably be in for a world of hurt.
Mueller is proceeding methodically, and constricting Trump little by little. It will give me joy when Trump and his fans take this as a positive development — which it is not.