JSFiddle - React, Tailwind, and code Playground

HTML

<div id="my_list">
  <div class="my_class">
    <div>
      <p> <strong>125</strong></p>
      <p class="condition ok"></p>
    </div>
  </div>
  <div class="my_class">
      <div>
        <p> <strong>10</strong></p>
        <p class="condition ok"></p>
      </div>
  </div>
  <div class="my_class">
     <div>
       <p> <strong>525</strong></p>
       <p class="condition"></p>
     </div>
  </div>
  <div class="my_class">
     <div>
       <p> <strong>20</strong></p>
       <p class="condition ok"></p>
     </div>
  </div>

JavaScript

var max = -1;

$("strong").each(function(){
    if($(this).parent().next("p").is('.condition.ok'))
        max = Math.max(max, $(this).text());
});

alert(max);