Q.tomatoes
My tomato plants are healthy and have a few fruits coming on, but there are no flowers. What to do?

There can be several reason for lack of flowers or your tomato not setting fruit.
This can also be related to the variety that your are growing. Not every variety will be a large producer.
https://www.gardeningknowhow.com/edible/vegetables/tomato/tips-for-growing-tomatoes.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossoms-no-tomatoes.htm