Rashi on Genesis 41:40/רש"י על בראשית מ״א:מ׳

1ישק —The Targum renders it by יתזן which means SHALL BE FED — all my people’s needs shall be provided through you. Similar are (15:2) “and the steward (ובן משק) of my house”, and (Psalms 2:12) “Provide yourselves (נשקו) with purity” old French garnison.

2רק הכסא ONLY IN THE THRONE — only in the fact that they shall call me king.

3כסא THRONE is a metaphorical term for royal rank, like (1 Kings 1:37) “And he has made his throne (כסאו) greater than the throne of my lord king”.