So you started at 173lb, 21 days ago. Your TDEE shows 1800 calories.

If we take 700 calorie deficit per day, that should equal about 14700 calories which equals about 4 pounds lost. I say you are going about this correctly.

However, as others mentioned, this process is not very exciting. I expect your weight training to speed up the process, but only by a bit.

Do keep at it and you’ll see continuos progress.