Is My Platy About To Give Birth?

I'm new to breeding... I'm not sure when to put my female in a net .. Her is a picture of her (taken this evening).

id say she is getting very close, im in a similar wait situation with a silver mm platy, she looks like she is about to burst but hasn't yet, I've been putting her in the breeder net at night while I sleep for 6-7 hours and letting her out when I wake up

not for a while. when she starts to square off then it'll be any day, so then you can put her in a birthing tank or net  to save the fry.

Not for a bit, she looks like she is starting to barely square off. So maybe another week and a half or two weeks.
 
Dont put them in breeder nets, it really really causes alot of stress and if you have lots of cover for the fry they should be fine. Plus, at the rate these guys reproduce you really dont want to keep all the fry.