How long until my cat has her kittens?

We found a cat that was very dirty and she started to follow us home, so we just picked her up. She was very skinny everywhere except at her abdomin, and you could see her shoulders and feel them sticking out. she had all of her claws, so if she wanted out of our yard, she had the right of passage. We found her on Monday and i had the feeling she was pregnant because she didn't like her belly being touched, and, she was enormous only at her belly. I research symtoms of pregnant cats, and she had all of them except for the pinking nipples. Today, my sister was petting her, then she told me she felt heartbeats, and i felt her stomach and there were itty-bitty heartbeats. a few seconds later, i felt kicking!!!!

So my question is, how many more days until my cat has her kittens if i can already feel her kittens kicking? I already know their gestation periods are around 65 days.