Is there a risk in opening the incubator now? Yes, but it’s your choice. Many people choose to do it and usually they get away with it. I’ll try to give you some information so you can make an informed choice.
The chicks can live at least three days without eating or drinking, often a day or two longer than that, because they absorb the yolk before hatch. So you don’t “need” to take them out for another two days.
The risk in opening the incubator is that a chick can become shrink-wrapped if the humidity drops too low. The membrane between the chick and the egg shell shrinks around the chick so it can’t move. That’s a death sentence unless you help the chick hatch. Sometimes you kill the chick by trying to help, especially if you are too early, sometimes you save it. How do you know that the chick is actually shrink-wrapped and not just slow to come out? How do you know it has absorbed the yolk, dried up blood vessels outside its body, and done all the other things necessary for it to be ready to hatch? It’s kind of complicated.
A few things have to happen before the chick will become shrink-wrapped. It’s possible that a chick can be shrink-wrapped anyway if the humidity was too low during incubation whether you open the incubator and let the humidity out or not. The big risk is when the egg has pipped and that membrane is on the border of becoming too dry and you let the humidity out. Does that happen a lot? Not really, but it does happen.
I personally consider it good practice to not open the incubator during lockdown, whether you see an egg pipped or not. Sometimes they pip on the bottom where you cannot see. But if I have an emergency in the incubator I need to take care of I’ll open the incubator and take care of it, whether another egg has pipped or not.