Show hide Loading Image in Lightning Web Component and call Apex Class

HybridAccountView.css

.hidemodel{
    display: none;
}

HybridAccountView.html

<template>
    <span class={cssDisplay}>
        <div id="spinnerDiv" class="demo-only demo--inverse" style="height: 10rem">
        <div class="slds-spinner_container">
            <div role="status" class="slds-spinner slds-spinner_medium">
                <span class="slds-assistive-text">Loading</span>
                <div class="slds-spinner__dot-a"></div>
                <div class="slds-spinner__dot-b"></div>
            </div>
        </div>
        </div>
    </span> 
</template>

HybridAccountView.js

import { LightningElement,wire, track } from 'lwc'; 
import isMoreThan10k from '@salesforce/apex/HybridAccountViewController.isMoreThan10k';
 
export default class HybridAccountView extends LightningElement {
    @track cssDisplay = '';  
    @wire(isMoreThan10k)
    returnedFlag( response, error){  
        if(response && response.data === 'Yes'){ 
            this.cssDisplay = 'hidemodel';
        }
        else if(response && response.data === 'No'){ 
            window.location.replace("Some URL to redirect if account assigned are low"); 
        }
    } 
}

HybridAccountView.js-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<LightningComponentBundle xmlns="http://soap.sforce.com/2006/04/metadata" fqn="hybridAccountView">
    <apiVersion>45.0</apiVersion>
    <isExposed>True</isExposed>
 <masterLabel>Hybrid Account View</masterLabel>
  <description>LWC to take decision which Account view to show </description>
  <targets>
      <target>lightning__RecordPage</target>
      <target>lightning__AppPage</target>
      <target>lightning__HomePage</target>
  </targets>
</LightningComponentBundle>

HybridAccountViewController.cls

/**
* @Date		    :	Feb 28 2019 
* @Author		: 	Jitendra Zaa
* @Description	:	Logic to decide Hybrid Account View
* 
* */
public with sharing class HybridAccountViewController { 
    @AuraEnabled(cacheable=true)
    public static String isMoreThan10k() {
        //Check if session Cache exists
        //If Session Cache contains '1' means user has 10k records
       if (Cache.Session.contains(UserInfo.getUserId())) {
           String isMoreThan10k = (String)Cache.Session.get(UserInfo.getUserId());
           if(isMoreThan10k == 'Yes'){
               return 'Yes';
           }
           return 'No';
       } 

        //Cant use aggregated query to with LIMIT, not good practice to fetch all record        
        //If cache does not exists then query SFDC
        List<Account> lsAcc = [Select Id FROM Account WHERE OwnerId = :UserInfo.getUserId() LIMIT 10001];
        if(lsAcc.Size() > 10000){
            Cache.Session.put(UserInfo.getUserId(), 'Yes');
            return 'Yes';
         } 
        Cache.Session.put(UserInfo.getUserId(), 'No');
        return 'No';  
    } 
}