Hide times when time has passed in custom select field in WooCommerce checkout

I have created a custom checkout field for collection times on my website (see image attached)

This is my current code:

add_action('woocommerce_before_order_notes', 'njengah_add_select_checkout_field');
function njengah_add_select_checkout_field( $checkout ) {
    woocommerce_form_field( 'daypart', array(
        'type'          => 'select',
        'class'         => array( 'njengah-drop' ),
        'label'         => __( 'Collection Time' ),
        'required'      => true,   
        'options'       => array(
            'blank'   => __( 'Select a collection time', 'njengah' ),
            '5:00_PM' => __( '5:00 PM', 'njengah' ),
            '5:30_PM' => __( '5:30 PM', 'njengah' ),
            '6:00_PM' => __( '6:00 PM', 'njengah' ),
            '6:30_PM' => __( '6:30 PM', 'njengah' ),
            '7:00_PM' => __( '7:00 PM', 'njengah' ),
            '7:30_PM' => __( '7:30 PM', 'njengah' ),
            '8:00_PM' => __( '8:00 PM', 'njengah' )
        )
    ), $checkout->get_value( 'daypart' ));
}

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However, the intention is to hide collection times when time has passed

E.G. - If its 6pm hide: 5:00 PM and 5:30 PM

Any help would be great

source https://stackoverflow.com/questions/67889698/hide-times-when-time-has-passed-in-custom-select-field-in-woocommerce-checkout