You are using acf_get_fields()
which is a function in ACF that gets the fields in a group. It is an internal ACF function that builds field groups. This function does not populate the field values.
To get he values in an array you would need to use get_fields()
then you would need to match up the values with the names
$fields = acf_get_fields('204');
$values = get_fields();
// some time later to get a value for a field
$value = $values[$field['name']];