No they are not doomed. Remember that the recommendations on this site are guideliens, not absolute laws of nature. If you follow the guidelines perfectly, you are not guaranteed success. If you violate a guideline your are not guaranteed failure. Many of us violate some guidelines and still usually do OK. The guidelines do not guarantee anything. They just improve your odds of success.
They aren't even due until tomorrow In theory, it take 21 days for chicken eggs to hatch if everything is perfect. In practice, many things can cause eggs to hatch early or late, by as much as two days and occasionally even more. Heredity, humidity, how they are stored before you put then in the incubator, size of the eggs, many different things can affect when they actually hatch. One real big factor is average incubating temperature. If the average incubating temperature is a bit high, they can be early. Real early. Don't put too much stock in hitting the 21 days exactly.
If you open the incubator during hatch, you can shrink wrap a chick if it has pipped. It is possible. I've done it. But it is also very possible the chicks will not be shrink wrapped. When I did it, I got one, not all of them. And there have been times when I shrink wrapped none of them. The guidleines say don't do it because something bad CAN happen. There is no guarantee that something bad WILL happen. It depends on a lot of different factors. How fast the incubator recovers the humidity, how long it is open, the relative humidity in the room when it is opened and who knows what else. You'd be surprised how tough some of those chicks are.
Just because somebody opens their incubator during lockdown and nothing bad happens does not mean you can. Their conditions are different. Just because I sometimes have problems doing that does not mean you will each and every time. Our conditions may be different. I know I am repeating myself but some people seem to have a lot of trouble with the concept that we use different incubators in different conditions and get different results.
Now, how do you tell if they are shrink wrapped? First, let's look at the hatching process. The chick internally pips, externally pips and the zips and hatches. Sometimes it takes a long time between these steps and sometimes they seem to happen pretty quickly. The chick is not just resting between the steps. It is actually working pretty hard. It has to absorb the yolk, dry up external blood vessels it no longer needs, switch from breathing in an all liquid environment to breathing air, and who knows what else. Some chicks do a lot of this between internal pip and external pip. These are the ones we like because they go from external pip to zip pretty fast. Some do a lot of this between external pip and zip. These are the ones that drive us crazy wondering if anything is wrong. They can easily take well over twelve hours for this step. I've never seen it, but some people report 24 hours between a normal pip and zip. Some even zip and complete the hatch before totally finishing all this stuff. Most of them make it OK.
If you try to help a chick before it is ready to hatch, you can kill it. If you open the incubator to help one, you may shrink wrap another. It is not easy to decide when to help. I don't always guess right and I don't have a good answer for you. If you see a yellow foam coming from the pip, it is now or never. That chick is getting ready to die. Do it now! It may already be too late. If the chick pipped a long time ago and the membrane looks white, it is time to consider action. But if you see blood when you start to remove the shell or membrane, you are too early.
I don't know if I said anything that helps you. Opening the incubator during lockdown is not a good thing, but it does not necessarily mean disaster. Good luck!!!
