Please follow the below code to get OptionSet Text and Value

function getOptions() {
    var obj = Xrm.Page.getAttribute("provide fieldSchemaName here");
    if (obj != null) {
        //Get OptionSet Text
        alert("OptionSet Text :" + obj.getText());
        //Get OptionSet Value
        alert("OptionSet Value : " + obj.getValue());
    }
}

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