NHS LSF Application

Hi so im about to apply for the LSF and i have my notification of entitlement letter. that shows that ive chosen to not take any loans out. it shows £0 on there. I applied to student finance in the first place to show the NHS that i am still eligible for student finance. Im not taking out any loans due to interest and religious reasons.
Along with uploading my notification of entitlement letter, Do i still have to upload a cover letter explaining why i didnt take out any tuition fee loans or maintenance loans just to be safe or is it okay with just the notification of entitlement letter?
Also, when you do apply for the LSF, how long does it take for them to get back to you about the outcome of your application?
Thank you.