Is there a point to delaying detrimental behaviours? I noticed that for me, it is very difficult to cease certain behaviours, such as eating junk food for example. Does Buddhism suggest a benefit to delaying such behaviours to later in the day, as opposed to early on? Is there an inherent benefit in delay, or does it change nothing, given the behaviour will have occurred that day anyways?
Is delay a viable strategy for urges?
Delay is not a viable strategy.
Instead you should use a wholesome mental reflection, in the spirit of the following sutta quote:

“And for the sake of what benefit should a woman or a man, a
householder or one gone forth, often reflect thus: ‘I am the owner of
my kamma, the heir of my kamma; I have kamma as my origin, kamma as my
relative, kamma as my resort; I will be the heir of whatever kamma,
good or bad, that I do’? People engage in misconduct by body, speech,
and mind. But when one often reflects upon this theme, such misconduct
is either completely abandoned or diminished. It is for the sake of
this benefit that a woman or a man, a householder or one gone forth,
should often reflect thus: ‘I am the owner of my kamma, the heir of my
kamma; I have kamma as my origin, kamma as my relative, kamma as my
resort; I will be the heir of whatever kamma, good or bad, that I do.’
AN 5.57

There is a sutta quote about moderation in eating:

“When a man is always mindful,
knowing moderation in eating,
his discomfort diminishes,
and he ages slowly, taking care of his life.”
SN 3.13

Perhaps your mental reflection can be along the lines of reflecting on what long term suffering will be brought on by consumption of junk food. You will be the owner and heir to the consequences of this action.