How read modbus sensor values in time - platform: sntp

I want to use modbus gas sensor and air pump with relay and sensor valuest must read in this time when pump has worked 15 sec. How activate sensor readings only in this time?

  - platform: sntp
    id: sntp_time
      - seconds: 0
        minutes: /2
          - switch.turn_on: relay            #turn air pump on
          - delay: 15sec

     #in here read sensor, how?

          - delay: 5sec
          - switch.turn_off: relay       #turn air pump off

something like this?
- modbus.write_register:
id: mod_bus
address: 0xFE