Could Anyone Esimate How Long Till My Guppy Drops?

is it possible to tell how long she will be be before she drops? last night i thought she was ready as she was at the top in the floating weeds ive put in for her, but none has arived and tonight shes quite buisy :L the photo's not brilliant it dosent show her dark patch, also i have had the magnifying glass looking for eyes and i cant see any, maybe shes ages off having them but shes alot bigger than the others in my tank

thankyouu xxx

I can't see a pic, but a way to tell if birthing is imminent is to look at her shape.
When she's ready to drop she will take on a boxy looking shape

If that's the pic I'd say she still has a little longer to go

haha had a few photo issues there lol!
thankyou cazgar!

You're welcome.
I'd expect her to drop in the next week as she almost squared off