Attempt to update GF Limit Choices value when user profile is updated (not working)

update-limit-choices-value.php

<?php 
// just a sample function to see what's going on
// not tied to a particular action yet
// we are on a user profile edit screen
add_action( 'wp', function() {
$form_id = 4; // GF user registration form
$choice_field_id = 13; // ACF 'time_slots' field
$choice_value = ''; // initializing the variable (otherwise PHP 7 freaks out)

$field_key = "field_5996299aee5a9"; // ACF 'time_slots' field
$slots = get_field_object($field_key);

global $user_id;
echo $user_id; // returns nothing

$timeslots = get_field('time_slots');
echo $timeslots; // returns nothing; why?
// without this how can I see which option is currently checked on the current user profile screen?
// need that for a conditional to update the GF Limit Choices $remaining_inventory value

if( $slots ) {
    
    foreach( $slots['choices'] as $k => $v ) {
        $choice_value = $v;
        $remaining_inventory = GP_Limit_Choices::get_entries_left( $form_id, $choice_field_id, $choice_value );
        
        if ( $remaining_inventory == 0 ) {
            echo '<li>Reserved: ' . $choice_value . '</li>'; // works
        } else {
            echo '<li>Available: ' . $choice_value . '</li>'; // works
        }
    }

}

wp(); // calling the function

?>