Q.radishes
My radish plants still have flowers on the leaves, so when do I pick them?

Your Radish plants have bolted or gone to seed.
This can happen when the weather warms, as Radish are a cool weather crop.
Harvesting should be done before the plants flower.
The links below will refresh you on the care requirements.
https://www.gardeningknowhow.com/edible/vegetables/radish/harvest-radishes.htm
https://www.gardeningknowhow.com/edible/vegetables/radish/radishes-bolting.htm