It depends on the meal as a whole for me - if I’m having some kind of veggie pasta for instance, I would just count the pasta. If I was having just meat and veg, I would count the veg.
Generally I bolus 5 mins before, sometimes with a multi wave depending on the meal (ie for pasta).
It’s all trial and error, and I’m sure what’s working for me would not for someone else! So just test test test and learn from each meal. I found the mySugr app very useful in the early days because I could look up when I’d last had that meal and see what I’d taken and the results, and then adjust.