How to add woocomerce delivery time information on product page with certain conditions

my applogies for being a baby php programmer.

I am trying to modify a php code to snipet to display on woocommerce product page (just below the add to cart button), order delivery time infomation, based on the following format and conditions:

Format

Order by 9PM {$order_by} for delivery on {$del_day}

Conditions

1. If days is between Mondays to Saturdays; after 9PM should print out the message

Order by 9PM {today} for delivery on {same day} 2. If days is between Mondays to Saturdays; before 9PM should print out the message

Order by 9PM {tommorow} for delivery on {tommorow}

3. If the weed day is sunday; after 9PM or before 9PM, should print out the message

Order by 9PM {today} for delivery on {next monday}

Here is what I have done so far

    
function delivery_estimate() {
   date_default_timezone_set( 'America/New_York' );  
    
   // if SUN delivery will be MON
   if ( date( 'N' ) >= 7 ) {
      $del_day = date( "l jS F", strtotime( "next monday" ) );
      $order_by = "today";
   } 
    
   // if MON/SAT after 8PM delivery will be day after tomorrow
   elseif ( date( 'H' ) >= 20 ) {
      $del_day = date( "1 jS F", strtotime( "tomorrow" ) );
      $order_by = "tomorrow";
   } 
    
   // if MON/SAT before 8PM delivery will be TOMORROW
   else {
      $del_day = date( "2 jS F", strtotime( "today" ) );
      $order_by = "today";
   }
 
   $html = "<br><div class='woocommerce-message' style='clear:both'>Order by 8PM {$order_by} for delivery on {$del_day}</div>";
    
   echo $html;
}