I would think the fingerling BG would now be over 4-5" long.

I would guess the channel cats are now 6-8" long.

These are conservative guesses based on the comment that you are feeding minimally. None of the fingerling-stocked BG or CC would have been able to eat minnows for several months, maybe by Sept/October '21.

So, yes, fish will be big enough to be caught using hook/line.