How to display featured image after first paragraph

I dont know if there is a newer solution for displaying featured image after first paragraph.

I was using the hook from David here

It was working at front but I was getting error undefined $post variable and null property error for the $post->ID. in error_log file.

So, I used global $post; and changed function like following:

add_filter( 'the_content', 'insert_featured_image', 20 );
function insert_featured_image( $content ) {
    if ( ! is_single() || is_admin() ) {
        return $content;
    }

    global $post;

    // Safety check in case $post is null or not an object
    if ( ! isset( $post ) || ! is_object( $post ) ) {
        return $content;
    }

    // Check if post actually has a featured image
    if ( ! has_post_thumbnail( $post->ID ) ) {
        return $content;
    }

    $feat_img = get_the_post_thumbnail( $post->ID, 'post-single' );

    return prefix_insert_after_paragraph(
        '<div class="incontent-featured-image">' . $feat_img . '</div>',
        1,
        $content
    );
}

function prefix_insert_after_paragraph( $insertion, $paragraph_id, $content ) {
    $closing_p = '</p>';
    $paragraphs = explode( $closing_p, $content );

    foreach ( $paragraphs as $index => $paragraph ) {
        if ( trim( $paragraph ) ) {
            $paragraphs[$index] .= $closing_p;
        }

        if ( $paragraph_id === $index + 1 ) {
            $paragraphs[$index] .= $insertion;
        }
    }

    return implode( '', $paragraphs );
}

It works fine and no errors, I want to know if my function is correct and safe. if so, that function should be updated.