Its actually up to individual preference! Most of the empolyer will want the helper to feed the LO before they can have their dinner.
For my case, my helper actually have dinner together with us as we wana her to know that she's actually part of our family. We will try to feed our LO ourself before the dinner, so that by dinner time he can self-feed and snack together with us.
Just do it whichever you are more comfortable with.
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Mummy of 2 cheeky monkeys