Angular wait for promise in module.run

I'm working on an angular application and I'm using a service which should load some details from the server before the execution of the application is continued.

application.run(($myService)=>{
    myService.loadSomething() //The application should pause until the execution  of the Service
                              //is completed until this the browser shoudl stay in a "loading state"
});

Is sometehing like this even possible?