New grill available to use. Would it be cost effective to buy a family sized pack of chicken and vegetables then cook them all at once on the grill on Sunday to have for the entire week of work lunches?

Trying to help my brother and his wife save money each month. Thinking to buy family sized chicken in bulk and grill that plus whole peppers and other vegetables (any advice?) so they can just do meal prep for their work lunches.

Does this actually save a lot or is it same effort and cost as if they were to just do batch oven cooking like sheet pan chicken and vegetables?

Grill is free for them to use.