Using the afterRender
binding can help you.
<ul data-bind="foreach: { data:caseStudies, afterRender:checkToRunThirdPartyFunction }">
<li><a data-bind="text: title, attr: { href: caseStudyUrl }"></a></li>
</ul>
function checkToRunThirdPartyFunction(element, caseStudy) {
if(caseStudies.indexOf(caseStudy) == caseStudies().length - 1){
thirdPartyFuncToDoStuffToCaseStudyLinks();
}
}