depends on whjat there is left in the soil for the worms to eat & how long you want to sit the soil. If there is little organic matter in the soil there is sod all for the worms to eat & you will likely get little worm activity or benefit, in my humble opinion. Mixing some 1/2 finished backyard compost, leaf mould or poop into the soil will give the worms something to eat & boost their numbers, turn over your soil & enrich it with worm poo. Keep the mixture damp & the worms will reward you. If you are prepared to wait 3-4 months maybe mix in some lawn clippings or kitche scraps & the worms can go to worm there. You will need longer than with compost as the organic matter is fresh.
rob