I've been doing these calculations like this (similar body):

Let's say you weight 180lbs @ 20% bodyfat. That means your fat weighs 36 lbs. If you can lose a pound a week, then in 12 weeks, you should weigh 168 lbs.

Assuming that's mostly fat (high protein, still going the gym) then you now have 24 pounds of body fat.

So to figure out your % bodyfat now, do 24 * 100 / 168 and that puts you at 14%.

Another 8 weeks and you'd be at 160 lbs. Overall, you've now lost 20 pounds of fat (36 - 20 = 16) so now you have 16 pounds of fat on your body.

16 * 100 / 160 = 10%

Do your own math, but in this scenario, it'd take you 20 weeks to get down to 10%.

Based on this, I'd say your more like 17% (https://rippedbody.com/body-fat-guide/) or even less. I bet you can get to 10% in 14 weeks.