There will be some fading of old shaded leaves. Yours look fine . Any serious deficiency will show up higher on the plants. Work more on your soil this winter and consider a mulch or breathable soil cover to keep plant lowers separate from grass/ soil contact.
It's not necessary to trim outdoor plants. Those lowers can make or break a harvest. If you have the wet weather you are expecting during late flower it could ruin big single colas. Those ozs of lowers would look more appealing if that were to happen. Good Luck!