Give it until the fish's belly squares off at the bottom, the female with the yellow tail looks fairly close just keep an eye on it for the next few days as it still has a little way to go. The one in the last photo looks further off than the yellow one.
Look at the pinned topics as these are there to help :
http/www.fishforums.net/index.php?/topic/253113-how-to-know-if-your-livebearers-ready-to-drop-fry-updated-150412/