have the wind at (one's) back

To be in a position of great success or good fortune, which can help generate further success by giving one confidence, optimism, and determination. After getting such a major promotion at work, Sally really has the wind at her back these days. With a 3–1 lead in the championship finals, the team definitely has the wind at their back as they go into the next game. She really struggled in her studies last year, but she's had the wind at her back ever since changing her major.