How will I know that my milk has come in?


Hi all,

I have been searching this questions on the internet and all I can find is signs that the milk is coming in but not how I will know officially know that my milk has let down and I’m no longer producing colostrum.

My colostrum is now white and very liquidy. I am also producing a ton more than I was a few days ago and my breasts have started to become engorged. So I think I’m on the right track for milk production but I would like to know what is the tell tale thing that you will 100% know the milk is here. Is there a moment it just fishes out or something?