I attended a training class many years ago on coaching and feedback. The two big things that I remember from that class were: give feedback to someone in a timely manner and that your manager is your top client. I had lots of clients at the time, but never considered that my manager was one of them. It was one of those aha moments for me and it made a lot of sense.
This type of thinking shifts how you think of your manager when you see them as a client. What would do differently for them if you saw them this way? Would you take more initiative to give them things ahead of time or provide things that they could use but had not asked for yet? How else could you support them?
When you see them as a client, you see them as someone that you want to succeed and you think about ways to help them accomplish that goal. This type of perspective changes how you see them, but it will also change how they see you. Ultimately, it helps you succeed when they do well, so it is in your best interest to support them.