import {TimeSlotPicker} from "react-native-timeslots-picker";

...

const [selectedTimeSlot, setSelectedTimeSlot] = useState(null);

return (
  <Box>
    <TimeSlotPicker
          slotResult={slot => {
            setSelectedTimeSlot(slot);
          }}
          timeSlotInterval={15}
          weekDayFromTime={'08:00'}
          weekDayToTime={'18:00'}
          weekendFromTime={'08:00'}
          weekendToTime={'12:00'}
        />
    <Text>Select Time Slot: {selectedTimeSlot}</Text>
  </Box>
)