The chart above is from the Economist / YouGov Poll -- done between March 26th and 29th of a nationwide sample of 1,500 adults, with a 3 point margin of error.
It shows that for the first time more Americans think Ukraine (22%) is winning the war instead of Russia (20%). About 37% say neither is winning.
As the chart below (from the same survey) shows, they also believe that a year from now Ukraine will be an independent nation ((38%) than believe it will be under Russian control (23%).