John Gill Commentary Genesis 43:28

"And they said, Thy servant our father is well, he is yet alive. And they bowed the head, and made obeisance." — Genesis 43:28 (ASV)

And they answered, your servant our father [is] in good
health, he [is] yet alive
Which is an answer to both his questions; and by calling their father Joseph's servant, he did obeisance to him in them, as well as by sending a present to him, which they delivered as coming from him his servant; and it is not improbable that Jacob sent his salutation to him as his servant, and so that part of the dream of Joseph's was also fulfilled, which represented the sun doing obeisance to him, (Genesis 37:9Genesis 37:10) : and they bowed their heads, and made obeisance ;
a second time, as they did, no doubt, at every time they gave answer to Joseph's questions; and this is again observed, to show the full completion of the above dream.