How much weight will I lose?

Hello, I am 18 years old & currently 147 pounds at 5’2.
I’m trying to lose about 15 pounds.
Starting today, I’ve been eating about 1,000 calories & I went to the gym for almost hour & a half. 15 mins on the elliptical, 50 mins on an exercising bike & 15 mins on the treadmill.
How much weight do you think I will be able to lose in a month if I stick to this diet/workout plan? I plan on going to the gym 4–5 times a week.
Please & thank you!