Trust your broody hen. They know more by instinct than we will ever know. You don't get guarantees with living animals and their behaviors, about anything can happen, but the vast majority of them will know what to do. The more I interfere the more likely I am to cause harm so I just leave mine alone as much as I can.
What a question. I don't know what your facilities look like, how many other chickens you have, anything like that. It sounds like you isolated the hen from the rooster and the rest of your flock (if there is a rest of your flock) while she was incubating the eggs. I don't do that. My broody hens incubate and hatch with the flock. The hen, eggs, and chicks are never isolated so I really don't have your kind of experience. My dominant roosters have never harmed baby chicks. Sometimes they will help Mama raise them but usually they just hang out with the rest of the flock and ignore the chicks and broody.
I've read several stories on this forum where people have had just one hen with a rooster and he helps her while she is incubating the eggs and especially helps her raising the chicks. Not all roosters behave that way but a good rooster should.
Since you did keep them isolated I'm a little nervous. I just haven't experienced that. With the vast majority of roosters I think you'd be fine letting him in there now, let alone tomorrow, but if you want to wait until the hatch is over and she's brought them off of the nest I won't criticize you. Don't wait too long, the chicks should be young enough that he assumes they are his, whether they are or not.
@Shadrach got your ears on? I know this is not exactly how you did this when you were in Spain but I immediately thought of you when I saw this. Your experience in "small" flocks exceeds mine.
But thank you! Is there any moment where she does go to lockdown? Or is that completely not a thing for hens?
