I have never used objective lens covers. If the binoculars are being stored in a case when at home or in transit then I don't really see the point. If you wear them hanging down then the objectives are protected from the rain.
I have an oft repeated story:- I was using my bins to look at some redpoll in the tops of some trees. Another birder walks past, asks me what I am looking at, I tell them. They the take off their backpack, take out a binocular case, remove their binoculars in a plastic bag, take the bins out of the bag, stow the bag in the case, remove the objective and eyepiece covers, stow the covers, put the case back in the backpack. They then have a look at the birds. When they are finished they reverse the process to return the binoculars to their bag.