Chickens are as consistent about when they lay as everything else, which means not at all. That does not mean individuals won't be consistent, just not chickens in general.
I've had hens lay an egg every morning at 9:00 am. If she did not lay by 9:00 she would not lay that day. I'd get 5 or 6 in a row, then she would skip a day.
I've had others that lay about the same time each day. Often (but not always) these lay every other day instead of every day.
Many chickens lay about an hour later every day until they get late in the day and they skip a day, then start back early the following morning and gradually get later every day until they skip again.
There are different triggers that tell a hen when to release a yolk to start the internal process of making an egg. One of these is daylight, another is when the previous egg is laid. I'm sure there are others. They have these triggers so eggs are laid in daylight, not at night when on the roost. Some triggers are stronger with certain hens, not so much with others.
It takes on average about 25 hours for an egg to go through the hen's internal egg making factory. That's an average, some will be faster, some slower. That's why a lot get a little later every day, especially when a strong trigger to release a yolk is when they lay the egg while others can lay at the same time each day.
Some people like to think that every chicken in the world is identical to every other one. They worry because some of theirs are not "normal". In this especially you do not need to worry. Every chicken is an individual and does what she does.
what time in the future should I expect my girls to lay?
When they want to. I get most of my eggs before lunchtime but occasionally I'll have one on the nest laying an egg as the others are going to the roosts. Probably got her triggers wrong. They can lay any time of the day.