Do wasps pollinate flowers or bees primarily involved in that task?

When a queen wasp emerges from hibernation she has to find food for herself and she will take nectar from flowers. In doing this she will pollinate those flowers she visits. Once she has larvae she will feed from a sweet substance, rather like honeydew, produced by the larvae, so will stop feeding from flowers.

Wasp larvae feed on insects and grubs captured initially by the queen, then by worker wasps.

Bees are by far the most prolific pollinators. It is reckoned that of all insect-pollinated plants, around 90 per cent of that pollination is done by bees.