Please don't wait to get signals a week after surgery. There's little or no feedback from our stomachs because all the nerves have been cut. Takes weeks or months to heal and tell you anything, and even then, as the others have said, the feeling of fullness can be really delayed.
I am 28 months post sleeve and I have just learned to eyeball what volume and mix of foods my stomach can manage, and usually stop a bit before that for safety's sake. If I go beyond that I get a runny nose and sneeze (Vagus nerve stimulation). By then it's too late though.
You'll learn how to manage as you go along. Just stick to small volumes at the start. At your stage you shouldn't be too hungry so you're just eating for fuel - treasure this time, it passes all too quickly. 😍
Stick strictly to the volumes you have been given. Weirdly I wasn't given any by my team so I asked for advice here and then stuck to THAT and it was very helpful.