Well, I know that most U-Boats carries a Lloyds of London maritime book showing all the world’s merchant vessels (practically all were insured by the company). Rather convenient for ID-ing your potential target. I rather doubt they had time-sensitive info like accurate cargo manifests. Even if Intel could get that stuff, just getting it to the U-boat skipper before he sailed? Seems unlikely.
Why would he need it before he sailed? They communicated via Enigma, didn’t they?