Having time coded transcripts of your rushes interviews is an essential part of the editing process and will ultimately save you time in the edit suite. This is especially true when you have a fast turnaround schedule.
Remember that if transcripts are going to be useful to your producer and editor, they need to be available on day one of the edit so getting them typed up is as important as having the rushes digitised. On a longer edit where the producer and editor will spend time on the pictures and rough assembly first, transcripts can be delayed until later in the first week.
The Producer / Director can choose the good bits from interview and order them to form the basis of a narrative structure while the editor is assembling rough pictures.
He or she can easily identify poor or unusable takes and cut these out without needing to waste time watching them in the edit suite.
The interview selects can be given to the editor as a template to start plugging into the pictures.
Transcripts can be used later for reversioning the programme if more interview material is needed or say a US interviewee is required for a US version of the programme and wasn't included with sufficient weight in your main broadcaster's version.