be just what the doctor ordered

To be exactly what one needed or wanted. The phrase does not usually refer to one's actual medical needs. I've been working on this paper all week, so a night out with friends is just what the doctor ordered! This beach vacation was just what the doctor ordered—I've never felt more relaxed. When you've been on the road for weeks, a home-cooked meal and your own bed are just the what the doctor ordered.

be just what the doctor ordered

be very beneficial or desirable under the circumstances. informal

1948 Gore Vidal The City and the Pillar The waiter brought her a drink. ‘Just what the doctor ordered,’ she said, smiling at him.