Send Action/Trigger in advance to the device?

Hello All,

I’m trying out HA to see if I can control my Sonoff switches.

I have a bunch of Sonoff MiniR2 switches that are currently controlled via eWelink.
Whenever I set a schedule via eWelink app, the device get’s triggered based on the schedule even when the router or internet is offline as long as there is no power disruption.

I was trying the same schedule in HA via SonoffLAN and it seems like the trigger for the device is sent only at that time when the trigger is supposed to happen and not in advance.

I’m not sure if I have configured the automation wrongly or the trigger is sent only at the last second from HA.

Can someone please help me understand when the trigger to the device is sent from HA?