Your manager will remember whether you showed up on time long after they forget your interview.

Ordinary reliability outlasts a good performance. An interview is one conversation and it fades, while turning up on time happens again and again, and repetition is what memory keeps. Managers remember who they never had to worry about long after they forget anything clever you said. That reputation is made out of unremarkable mornings.

Treat arrival as part of the job rather than the preamble to it. Choose a leaving time that still works when something goes slightly wrong. Hold it for a month, which is long enough for people to notice without you pointing at it.