How to disabled and Enabled button in Aura Component with APEX ?

* I have a method in class apex:

@AuraEnabled
public static Boolean getStageOpportunity(String recordId){
Set<Id> recordIds = new Set<Id>{recordId};
List<ContentDocumentLink> cdlkLista = [SELECT Id, LinkedEntityId, ContentDocumentId FROM ContentDocumentLink WHERE LinkedEntityId IN :recordIds];
Set<Id> oppIds = new Set<Id>();
for (ContentDocumentLink cdlk: cdlkLista) {
oppIds.add(cdlk.LinkedEntityId);
}
List<Opportunity> oppLista = [SELECT Id, Name, StageName FROM Opportunity WHERE Id = :oppIds];
Set<String> stageNameX = new Set<String>();
for (Opportunity oppEtapa : oppLista) {
stageNameX.add(oppEtapa.StageName);
}
Boolean btnDelete = false;
if (stageNameX.contains('Ganada')) {
btnDelete = true;
} else {
btnDelete = false;
}
return btnDelete;
}

* I have a function in Controller.js:

disableBtnDelete : function(component, event) {
var action = component.get("c.getStageOpportunity");
action.setCallback(this,function(response){  
var state = response.getState();  
if(state=='SUCCESS'){  
var result = response.getReturnValue();         
component.set("v.btnDeleteDisable",true);  
//    component.set("v.btnDeleteDisable",false); 
}  
});
$A.enqueueAction(action); 
}

<aura:component controller="gestionArchivosOppCtrl" implements="flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,lightning:availableForFlowScreens,force:appHostable,force:hasRecordId" access="global" >
<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>  
<aura:attribute name="files" type="ContentDocument[]"/>  
<aura:attribute name="recordId" type="String" />  
<aura:attribute name="acceptFileTypes" type="String" />  
<aura:attribute name="showFileHeader" type="Boolean" default="true" />  
<aura:attribute name="fileHeaderText" type="String" default="Archivos" /> 
<aura:attribute name="uploadMultiple" type="Boolean" default="true"/>      
<aura:attribute name="showSpinner" type="boolean" default="false"/>
<aura:attribute name="btnDeleteDisable" type="Boolean" default="false"/>
<div class="slds-card slds-card_boundary">  
<!-- show or hide header -->
<aura:if isTrue="{!v.showFileHeader}">
<div class="slds-page-header">{!v.fileHeaderText}</div>  
</aura:if>
<div class="slds-align_absolute-center">  
<lightning:fileUpload multiple="{!v.uploadMultiple}"   
accept="{!v.acceptFileTypes}" 
recordId="{!v.recordId}"   
onuploadfinished="{!c.uploadFinished}" />  
</div>  
<br/> 
<div class="slds-form--compound">
<table class="slds-table slds-table--bordered">  
<!-- hide the table header if file is empty -->
<aura:if isTrue="{!not(empty(v.files))}">
<thead>  
<tr>  
<th></th> 
<th>Titulo</th>  
<th>Tipo Archivo</th>
<th>Última Modificación</th>
<!-- <th>Propietario</th> -->
<th>Eliminar</th>     
</tr>  
</thead>  
</aura:if>
<tbody>
<aura:iteration items="{!v.files}" var="f">  
<tr> 
<td></td> 
<td>
<a href="javascript:void(0)" id="{!f.Id}" onclick="{!c.previewFile}">
{!f.Title}
</a>
</td>  
<td>{!f.FileType}</td> 
<td><lightning:formattedDateTime value="{!f.LastModifiedDate}" year="numeric" day="2-digit" month="long" hour="2-digit" minute="2-digit"></lightning:formattedDateTime></td>  
<td>
<a href="javascript:void(0)" id="{!f.Id}" onclick="{!c.deleteSelectedFile}">
<lightning:buttonIcon iconName="utility:delete" alternativeText="Eliminar Archivo" />
</a>
</aura:set>
</aura:if>
</td>
</tr>  
</aura:iteration>  
</tbody>  
</table>  
<!-- show spinner logo when needed -->
<aura:if isTrue="{!v.showSpinner}">
<div class="slds-spinner_container">
<div class="slds-spinner slds-spinner--medium" aria-hidden="false" role="alert">
<div class="slds-spinner__dot-a"></div>
<div class="slds-spinner__dot-b"></div>
</div>
</div>
</aura:if>
</div> 
</div> 
</aura:component>
<!-- <aura:component controller="gestionArchivosOppCtrl" implements="flexiPage:availableForAllPageTypes,force:appHostable"> -->