How to set a TimeOut after a value of an Observable?

  angular, typescript

So I have a DataService where I have two Observables. From the server, I get multiple objects and their materials that are saved into the Observables. Now I have the problem that all of the objects get shown at the same time, but I want to have a couple of seconds break between the objects.
Where can I set a TimeOut so they won’t be displayed at the same time.

if ( {    
 = => {
            this.object = data; 

      if( == undefined){ => {
          this.mtl = data;

Source: Angular Questions

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