Wire service is not fetching the data from apex class

HTML 

<template>
    <lightning-card title="Product Search">
        <div class="slds-m-around_medium">
            <lightning-input name="enter-search" label="Search" type="search" onchange={handleSearch} is-loading={isSearching}></lightning-input><br/>
            <lightning-input name="NABTick" label="NAB Price List" type="checkbox" onchange={handleCheckbox} ></lightning-input><br/>
        <lightning-button label="Search" name="search" title="Search Products" onclick={findProductKey} variant="brand" ></lightning-button>&nbsp;&nbsp;&nbsp;
            <lightning-button label="Cancel" name="cancel" title="Cancel" onclick={handleCancle} ></lightning-button>
        </div>
        <div>
            This is the search key value ={searchKey}
            This is NAB Check list Value={NABcheckbox}
        </div>
        <template if:true={allProduct.data}>
            <div>
                <template for:each={allProduct.data} for:item=product>
                    This is the prodcut Id :{product.Id}
                  <c-product-search-result-wired key={product.Id} product={product}></c-product-search-result-wired>
                </template>
            </div>
        </template>
    </lightning-card>
</template>

Vchild component 

<template>
    <div class="slds-p-around_medium lgc-bg" key={product.Id}>
        <ul class="slds-has-dividers_bottom-space">
            <li class="slds-item">
                <lightning-tile label={product.Name}>
                    <ul class="slds-list_horizontal slds-has-dividers_right">
                        <li class="slds-item">Product Code: {product.ProductCode}</li>
                        <li class="slds-item">Eng Status: {product.Eng_Status__c}</li>
                        <li class="slds-item">Dark Knight</li>
                        <li class="slds-item">Dark Knight</li>
                    </ul>
                </lightning-tile>
            </li>
        </ul>
        </div>     
</template>

Parent JS

import { LightningElement,track,wire } from 'lwc';
import getProducts from '@salesforce/apex/productSearch.getProducts';
const DELAY = 300;
export default class ProductSearchWired extends LightningElement {
    @track searchKey='';
    @track NABcheckbox= false;
    @track allProduct=[];
    @wire(getProducts,{productSearchKey:'$searchKey'})
    products({data,error}){
        if(data){
            this.allProduct = data;
        }
    }
    handleSearch(event){
        window.clearTimeout(this.delayTimeout);
        const searchKey = event.target.value;
        // eslint-disable-next-line @lwc/lwc/no-async-operation
        this.delayTimeout = setTimeout(() => {
            this.searchKey = searchKey;
        }, DELAY);
    }
    handleCheckbox(){
        this.NABcheckbox = true;
    }
    get isSearching(){
        if(this.allProduct){
            return false;
        } else {
            return true;
        }
    }
}

Child JS File

import { LightningElement,api } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';
export default class ProductSearchResultWired extends NavigationMixin(LightningElement) {
    @api product;
    navigateToProduct(){
        this[NavigationMixin.Navigate]({
            type: 'standard__recordPage',
            attributes: {
                actionName: "view",
                recordId: this.product.Id,
                objectApiName: "Product2"
            }
        });
    }
}

Apex Class Controller

public static List<Product2> getProducts(String productSeachKey)
    {
          if( String.isNotEmpty(productSeachKey))
        {
            return [SELECT Id,Name,ProductCode,Eng_Status__c,Quotable__c,USD_Price__c FROM Product2 WHERE IsActive= true AND Eng_Status__c IN ('Production','Procurement','Prototype','Hold')
                    AND Field_Replaceable_Part__c = false AND Base_Price_List_Item__c != null AND (Name LIKE : '%'+productSeachKey+'%' OR ProductCode LIKE: '%'+productSeachKey+'%')
                    ORDER BY SBQQ__SortOrder__c ASC NULLS LAST];
        } else 
        { 
          return [SELECT Id,Name,ProductCode,Eng_Status__c,Quotable__c,USD_Price__c FROM Product2 WHERE IsActive= true AND Eng_Status__c IN ('Production','Procurement','Prototype','Hold')
          AND Field_Replaceable_Part__c = false AND Base_Price_List_Item__c != null ORDER BY SBQQ__SortOrder__c ASC NULLS LAST];
        }
    }
}