actually, have a 9 years of Objective C developer and he can create an App in Objective c in just 4-5 days, but we are concerned about Apple standards. By the time we will gradually convert App in Swift. So it is important us to know follow in that manner.

Somehow Yes, but once We developed and release binary to AppStore that time , it will be clear. I will Share my experience for sure here. So it can be helpful to others as well.