Gathering information for coach that should be here anytime now (3,9)

I believe the answer is:

due diligence

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'should be here anytime now' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'gathering information for coach' is the wordplay.
'gathering information' becomes 'due' (I can't justify this - if you can you should give a lot more credence to this answer).
'for' says to put letters next to each other.
'coach' becomes 'diligence' (I've seen this before).
'due'+'diligence'='DUE DILIGENCE'

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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