How to filter today on weekday

First of all weekday() function is returning the index of the weekday from 0 to 6 where 0 is either Sunday or Monday (Monday in my case, not sure if this is influenced by any internationalization option).

Nevertheless I was not able to use weekday function passing dynamic $NOW weekday($NOW).

I am not sure if there is an easier solution, but you can run a script operation to get the current weekday name prior to your data operation

module.exports = async function(data) {
	const today = new Date();
	const weekdayName = today.toLocaleDateString('en-US', { weekday: 'long' });
	return weekdayName;
}

and then use the ($last) result in the following data operation

{
    "filter": {
        "day_name": {
            "_eq": "{{$last}}"
        }
    }
}