How to detect when admin user is on the All Posts page?

If you need exactly on All Posts page, Not on All Pages, nor All Products or etc –

if 
(
    'edit.php' === $GLOBALS['pagenow']
    && ( 
        isset( $GLOBALS['typenow'] ) 
        && '' == $GLOBALS['typenow'] 
        || 'post' == $GLOBALS['typenow'] 
    )
)
{
    // Do what you like...
}

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