It is 3 pm and I am at 838 cals. So, I am thinking I am right about on track. I dunno. I technically could be eating 2000 cals a day and still losing weight, but do I NEED to be eating 2000? I was thinking of shooting for more around 1500-1800. If I need the 2000 then I still have 1200 to go and that just seems impossible.
If you're looking for anecdotes, I eat around 2,000 a day now, and I'm normally around 700 at 3pm (before my afternoon snack) and 1,000 at 6pm (before dinner). I'm an evening snacker, so I save my calories for then. So I think you're probably on track.
My main concern is that going to 1500-1800 now (while I can still lose weight at 2000) would not leave me enough cals to reduce to (without going below 1200) should I hit a plateau before I finish losing the 50 pounds. I also don't want to have to up my workouts to over an hour a day to supplement my inability to reduce calories.
As an anecdote, I personally didn't reduce calories farther as I lost more. Once I started counting calories (which was around 25-30 pounds in), I stuck with pretty much the same intake until I was done. Actually, I bumped my calories *up* a little towards the end, because I was hungrier when I was lean than when I was fat. I also didn't increase my exercise significantly. A little bit, yes. But I'm talking "walk 30 minutes 5-6 days a week" type of exercise. And I never plateaued. I didn't always see a scale loss every week, but my long-term trend didn't flatten out until I bumped my calories back up close to maintenance and called it good.
Everyone is different, and there's no way of telling how your body will react. But there's no reason to think that your body would plateau on 1500-1800 calories a day.
OTOH, if maintenance for you is 2,600, I wouldn't stop at 1,600 unless you felt satisfied with that few calories. 1,000 calories a day is a big deficit to maintain, and it wears on you after a while. I did ~6 months of ~750 calories a day of deficit, and it wore on me by the end.