I have been looking at the wheat this week and the crop is all over the board. With another wet fall, some wheat was planted late. If you have not applied your nitrogen, now can be a good time, but if you are looking to control weeds you may be looking at a late Feb. or early March application. It seems wheat here gets more than one flush of weeds, especially broadleaf weeds, and can get more than one flush of ryegrass.
For ryegrass, you will need something that has a residual effect, and rotate chemicals and crops if you have bad ryegrass. Another note is if the wheat is spotty or thin you may want to look at a hay option if the crop does not look like it will yield very well. Wheat can look thin then surprise you, but there has to be good tillering.