Ember 2.4 - get current user using a service and simple auth after login

I have the following problem with getting the current user using an instance initializer, a service and ember-simple-auth library. More specifically, I have managed to get all the attributes of my service "user" but only when I refresh the page after login. I would like the promise that my service returns to be immediately accessible right after login. My code snippets are available below:

app/instance-initializers/current-user.js

export function initialize(appInstance) {

    appInstance.inject('route', 'account', 'service:account');
    appInstance.inject('controller', 'account', 'service:account');
    appInstance.inject('template', 'account', 'service:account');
}

export default {
    name: 'account',
    initialize: initialize
};

app/services/account.js import Ember from 'ember';

export default Ember.Service.extend({

session: Ember.inject.service('session'),
store: Ember.inject.service('store'),

loadCurrentUser() {

    const accountId = this.get('session.data.authenticated.auth_token');
    console.log("This is my account", accountId);

    if (!Ember.isEmpty(accountId)) {

        this.get('store').findRecord('profile',  accountId).then((profile) => {
            this.set('user', profile);
            console.log("account_group",this.get('user.user_group'));
            console.log("account_username",this.get('user.username'));
        }); 
    }
    return this.get('user')              
}
});

Then I call the loadCurrentUser function in my application route:

import Ember from 'ember';
import ApplicationRouteMixin from 'ember-simple-auth/mixins/application-route-mixin';

export default Ember.Route.extend(ApplicationRouteMixin,{

    beforeModel(){
    console.log("This is my currentUser",   this.get("account").loadCurrentUser());
},

});

And finally in my template I can access the username of my user like this:

Logged in as: 

but only when I refresh my page.

I assume that I call my function "loadCurrentUser()" in the wrong place but I can't find anywhere a proper solution. Thanks in advance.