At some point, the red-shift of the light will be so far under the ‘infra-red’ (read: heat), part of the spectrum that it will be undetectable. Then you will have reached the edge of the known Universe. There may very well be ‘stuff’ out there beyond that physical limit, but we won’t ever see it in this lifetime................................
I get that part, but suppose the current level of understanding red-shift is not fully known, perhaps based on information from the JWST causes a change in that understanding.
Back when Neil Armstrong walked on the moon, who would have thought the JWST would exist.