Sorry for your loss mate.
There is no correct thing to do or traditions you should follow. Its a personal decision that you alone should make and to be honest I wouldn’t listen to others direct advice as every situation is different.
When did you last see your Father? If that memory is a pleasant one then you may wish to treasure that memory.
If on the other hand your final memory isn’t a particularly nice one then seeing your Father at peace may help you.
I will tell you the same thing I tell every family I deal with.
Do not think about it or try to make a decision. You have until a few hours before the funeral to see him so stop thinking about it.
If you wake up one morning over the next few days and feel the need to see him then go with that feeling. If you don’t get the urge then don’t go, but do not feel guilty about not going.
Speak to your funeral director. He is a professional and the person who will be able to offer you the advice and support you need. They will only want whats best for you.
Also remember that if you are aprehensive about seeing him then you can ask to spend time in the chapel of rest with the coffin sealed. That way you can have the private time to say your goodbyes before the funeral without the concern about a negative lasting impression.
Goodluck for Friday and my best wishes are with you and your family.