How to wait HTML load until get data in angular?

this.router.navigate(['prob/telecomnewdeal'], { queryParams:{ 'companyId': this.selectedCompnay, 'domainId':this.domainId } });

ngOnInit

ngOnInit(): void {
   this.route.queryParams.subscribe(params => {
     this.companyId = +params['companyId'];
     this.domainId = +params['domainId'];
   });

this.telecomDealService.addNewDeal(this.userEmail, false, this.companyId, this.domainId).subscribe((data: TelecomDealList) => {

       this.dealQuestionsList = data.AssginedTowers[0].Questions;
       let test = this.dealQuestionsList[0].IsHeader
       this.addloadded = true;
       console.log(this.addloadded);
       for (var i = 0; i < data.AssginedTowers[0].Questions.length; i++) {
         if (data.AssginedTowers[0].Questions[i].listAnswerOptions != null) {

           this.drpoption = data.AssginedTowers[0].Questions[i].listAnswerOptions;
           this.dealQuestionsList[i].listAnswerOptions = [];
           for (var j = 0; j < Object.entries(this.drpoption).length; j++) {
             let tempfilter: Item;
             tempfilter = {
               text: Object.entries(this.drpoption)[0][0],
               value: Object.entries(this.drpoption)[0][0]
             };

             this.dealQuestionsList[i].listAnswerOptions.push(tempfilter);
           }

         }
       }


       this.spinner.hide();




       });