The two charts above are from the Morning Consult Poll. They polled 1,990 adults between May 31st and June 1st, and 2,014 adults between June 3rd and 5th. The charts compare the difference between the two polls taken only a few days apart. Both polls had a 2 point margin of error.
Note that the support for the protests is growing, while the support for using the military or the National Guard to police the protests is dropping. This is a good thing. I hope these trends continue.