Mine layed the first egg on this February 9th. Squatting DEFINETLY means thy are close

But it’s random how long it will be, a few days, a couple weeks! My first layer (An Easter Egger named Robin) took a few weeks of squatting before she layed. But if your pullets are around the same age as the squatter, it won’t be long!! Every chicken is different, nobody can tell you exactly how long it will be. I used an egg calculator and it said the first egg would be on Feb. 14, but it came earlier! My second layer start a few days later.
Sadly, no, you can’t really force their bodies to lay earlier. It’s how they were made and how they mature. I was expecting the egg for weeks and I lost hope when—pop!—a green egg sat in the nesting box when I came to let them in the run one morning.
Another sign that Robin gave was that she would not SHUT UP! She was so loud, and sounded like she was in pain, but acted normal. I asked BYC and they said that it was normal for a pullet about to start laying. She did this for a while.
Just a heads up, if you are lucky enough to be there when they lay it, it will sound like what chickens sound like on tv and in animations, “buk-buk-buk...BAGOCK!” Some of the flockmates will start doing this. My buff orpington pullet, Brittney, did it today while one of my Barred Rocks was laying. It’s funny when they do it!