When I married, one of the many, many things which helped me integrate into my bride's family was that her father was punctual to a fault.
He routinely counted backwards from an appointment, carefully adding time to the trip so as to handle traffic delays.
He even decided that his departure times would be something like 4:48 instead of 5:00, to give an extra cushion. He always said it with a big smile.
He always had a paperback book with him to handle the times he arrived earlier than expected.