cross that bridge when (one) comes to it
Meaning
To address something only when it actually happens or becomes an issue.
For example
A: "Should we reach out to our distributors and let them know there may be a problem down the line?" B: "No, let's just cross that bridge when we get there."
The job interview is a week away, so I'm not worried about it yet—I'll cross that bridge when I come to it.
