This is a recent poll done by Greenberg/Quinlan/Rosner Research. It was done between January 29th and February 3rd of a random national sample of 1,000 registered voters.
It shows that majority would favoring impeaching Trump if Special Prosecutor Mueller finds that Trump was involved in collusion with Russians (65%), if Trump committed financial crimes (63%), If collusion occurred without Trump and he obstructed justice (62%), if just obstruction of justice by Trump happened (62%), if aides colluded w/o Trump (59%), or if obstruction occurred w/o Trump (58%).
There is an extremely good chance that Mueller will find that at least one of those things happened (and probably more than one). That will put pressure on Congress to impeach Trump.
The congressional Republicans have imbibed the orange kool-aid though, and it is unlikely they will move to impeach him if they retain control of Congress. This makes it even more important that Democrats are able to flip control of Congress in the November election.