I usually tend not to feed my outdoor plants unless they absolutely need it. The earth, environment, and atmosphere provide all elements for the plant, nitrogen will come from storms or rain water, phosphorus comes from rich soil so does iron and zinc, etc etc all elements needed to grow a plant primary, secondary, or trace elements can all be found in outdoor grows ( thats why I personally find no need to feed them they thrive and do great on their own with a little bit of water).
Depending on where you live will depend on evaporation pressure, this will determine how much they will eat or drink being outside, the faster they dry up this will tell you, you have a high evaporation pressure meaning they will tend to eat and drink more than usual. Outside this is typically usual inside this can lead to health problems.
So to determine if they are ready, if possible lift the pots if they are light they are ready for water, if they still have weight behind them than they can hold off until they are dry and have minimal to no weight
So if they are wet from the rain let them dry up first. Being said your still in pots id at least watch it once a week