JSFiddle - React, Tailwind, and code Playground

HTML

<table class="data-table" id="product-attribute-specs-table3">
    <colgroup>
        <col width="25%">
            <col>
    </colgroup>
    <tbody>
        <tr class="first odd">
            <th class="label">SKU</th>
            <td class="data last">904532</td>
        </tr>
        <tr class="odd">
            <th class="label">Width</th>
            <td class="data last">20</td>
        </tr>
        <tr class="even">
            <th class="label">Lead Time</th>
            <td class="data last">491</td>
        </tr>
        <tr class="last odd">
            <th class="label">Depth</th>
            <td class="data last">63</td>
        </tr>
    </tbody>
</table>

<table class="data-table" id="product-attribute-specs-table">
    <colgroup>
        <col width="25%">
            <col>
    </colgroup>
    <tbody>
        <tr class="first odd">
            <th class="label">SKU</th>
            <td class="data last">904532</td>
        </tr>
        <tr class="odd">
            <th class="label">Width</th>
            <td class="data last">20</td>
        </tr>
        <tr class="even">
            <th class="label">Lead Time</th>
            <td class="data last">49</td>
        </tr>
        <tr class="last odd">
            <th class="label">Depth</th>
            <td class="data last">63</td>
        </tr>
    </tbody>
</table>
        <table class="data-table" id="product-attribute-specs-table1">
    <colgroup>
        <col width="25%">
            <col>
    </colgroup>
    <tbody>
        <tr class="first odd">
            <th class="label">SKU</th>
            <td class="data last">904532</td>
        </tr>
        <tr class="odd">
            <th class="label">Width</th>
            <td class="data last">20</td>
        </tr>
        <tr class="even">
            <th class="label">Lead Time</th>
            <td class="data last">149</td>
        </tr>
        <tr class="last odd">
            <th class="label">Depth</th>
            <td class="data...

JavaScript

var m = $('#product-attribute-specs-table th:contains("Lead Time")').next().text();
//var tableVar = $('th:contains("Lead Time")').closest('table');
alert(m);