If I’m in a hurry/tired/drained and don’t want to put much mental effort into making food, I make rice, steam some veggies, and add a sauce.
We get big, inexpensive bags of frozen veggies with broccoli, cauliflower, and carrots. I steam them for a few minutes while the rice cooks. Then I whip up a sauce, usually some kind of Thai-inspired spicy peanut butter sauce.
If there’s leftover rice, I let it hang out in the fridge for a couple days, and then use it to make fried rice, which is basically the same as above, but all fried together and possibly with different flavors :)
I’d just jump it. You can add them directly to the pan or wok. As to when, the question is how you want the end texture to be. When you put frozen food into a pan, the first thing they’d expel is water. So if you want a dry dish, put them in the beginning to dry them out. If it’s a saucy dish, you can put them at a later point.