How long before this egg hatches? I think it's in trouble

[MoniqueA]

A bad chicken killed the two babies, only one egg left and I heard peeping last night about 2am. I am worried the chick won't hatch by tonight, is it ok? I don't hear peeping anymore, it is under its Mama. But the other chicken could have stepped on it (it visually looks fine) when it killed the babies. I can break the shell open if needed

Thanks