You know what it means to show up for a mate. Let him show up for you too. That's what mates do.
You respect his judgement. Ask him. You learn from one another, build on each other’s experience and make room for company when that is what matters.
Be clear about what you want: another view, a hand with something, or just hanging out. You can start with something simple and grow from there.
When he asks you, be clear about what you can do. “I can come over Saturday morning.” “Give me a call after six.” Agree on it, then follow through.
Backing each other can be learning, getting something done, taking a breather or enjoying some company.