I see some dollar weed in there too. I used "Image" last year with good results. I'd wait a few more weeks for any chemicals.
And if your Z is going from seed head to flower, cut it! You don't want the grass to waste energy on seed and flower. This time of year I cut mine as soon as I see the seed heads, long before the blades need cut. That keeps more "energy" in the roots in blades.