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Of course, make them aware that they are responsible for keeping their own rooms clean, too and they don’t need a chart to tell them.
Be perfectly clear when you expect your kids to finish their chores, or else they would buy more time and would end up not doing anything. My little boy usually mean well and would usually do his chore, but he would easily get waylaid by little things. For instance, if I ask him to fix his toys, he will find a coloring book and would end up coloring his book instead of finishing his task. For younger children, you need to check on them from time to time. Asking them how much time they will need to finish cleaning up would give them valuable lessons on time and home management as well.