Okay since she's getting so close, my guess will be around 2am Monday morning. Most births seem to be at odd hours any way.

When I was about 8 years old I had a female cat and she was pregnant. It was June 5th in the afternoon and I remember telling my mom that I wish she'd have her kittens soon. A little while later I heard her howling and I saw a kitten coming out of her. We got a box for her and we were able to watch her give birth to 6 healthy kittens. It was quite a learning experience for me since I was so young. Our female dog became the kittens second mother and our cat was fine with this because she trusted her so much.