The Centaur and Atlas stages are just about full of liquid hydrogen and oxygen, with "topping in progress..."
The launch countdown is progressing on schedule; the only issue being worked is the wind, with the maximum allowable wind speeds being 33 knots. Gusts have been recorded this morning of up to 35 knots, so they are watching that closely. At T minus 4 minutes, there is a built-in "hold." They may use that hold to try to wait for the winds to subside -- or they may decide it's safe and launch it on time. We'll just have to wait and see.