If you are still losing what is the calorie range for someone who’s one year post op?

That's tricky without your current height and weight and the goal you're wanting to reach, as there's no universal answer. You can work out your calories for loss with this online calculator: https://www.calculator.net/calorie-calculator.html

It does metric and imperial, and can give you a deficit to reach goal as well as maintenance calories.

At a year out I was still eating about 1000 calories but I want to echo what @Smanky said that this has a lot to do with your height, current weight, goal weight, biological sex, and your activity level and will be different for everyone. I am personally a 4'10" woman with a medium activity level, so obviously if you're taller, a man, more active, etc you need more than that.

My weight loss is slow now. I am trying to expand my menu so lots of different foods with different calorific values. So it may be up and down on any given day but my average is about 1300 this week.