How fast can I lose weight if I drop 800-1000 calories a day?

The question itself isn’t embarrassing to ask, but it’s why. It’s all from Dr. Pepper! I don’t want anyone in real life to know how much I drink bc it’s so bad. My diet isn’t the best, but it isn’t terrible. I am somewhat active. I get a ton of exercise in at work, but that’s only about 20 hours a week.

I’m thinking if I drop the soda, that’ll be enough calories where I can shed some of this access weight.

Edited to add: I’m 5 ft 4 in and 161 pounds. Yesterday, with the Dr. Pepper, I consumed about 2200 calories and that’s about average for me. Some days are better than others.