javascript - How can i return status inside the promise?

I started to learning promise with loopback and jsforce, and couldn't handle this problem; I couldn't return status var inside promise to cb() function.
Basically i want to connect salesforce and get data via JSforce and write it to db via loopback. Then want to return created/updated/error records to client after remote mothed called.

I'm developing with Loopback via using Node.JS & Express.js
I'm using JSforce library to connect salesforce

How can I fix that?

Here is my code:

module.exports = function(Contact) {
  var jsforce = require('jsforce');
  var async = require("async");
  var lr = require('lr.js');

  Contact.ImportContacts = function(cb) {
    // Salesforce Projects List
    var sf_projects = [];
    //Salesforce Conn String

    var conn = lr.SalesforceConn();
    conn.apex.get("/Contact/", function(err, res) {
      var status = {
        "Created": [],
        "Updated": [],
        "Error": ""
      };
      if (err) console.log(err);

      sf_projects = res;

      // Clear result
      status.Created.length = 0;
      status.Updated.length = 0;
      status.Error = "";

      if (sf_projects != undefined) {
        async.eachSeries(sf_projects, function(contact, callback) {
          Contact.findOrCreate({
              where: {
                co_SalesforceID: contact.Id

              }
            }, {
              co_Name: contact.FirstName,
              co_Surname: contact.LastName,
              co_Salutation: contact.Salutation,
              co_Title: contact.Title,
              co_Department: contact.Department,
              co_Email: contact.Email,
              co_PhonePersonal: contact.HomePhone,
              co_PhoneWork: contact.Phone,

              co_PhoneCell: contact.MobilePhone,
              co_Description: contact.Description,
              co_SalesforceID: contact.Id
            },
            function(err, cntct, created) {
              if (err) console.log(err);
              if (created) {
                status.Created.push(cntct.id);
                console.log("Contact created. SalesForeID: " +
                  cntct.co_SalesforceID +

                  " ContactName: " +
                  lr.isDefined(cntct.co_Salutation) + " " +
                  lr.isDefined(cntct.co_Name) + " " +
                  lr.isDefined(cntct.co_Surname));
              } else {
                Contact.replaceById(cntct.id, {
                    co_Name: contact.FirstName,
                    co_Surname: contact.LastName,
                    co_Salutation: contact.Salutation,
                    co_Title: contact.Title,

                    co_Department: contact.Department,
                    co_Email: contact.Email,
                    co_PhonePersonal: contact.HomePhone,
                    co_PhoneWork: contact.Phone,
                    co_PhoneCell: contact.MobilePhone,
                    co_Description: contact.Description,
                    co_SalesforceID: contact.Id
                  },
                  false,
                  function(err, obj) {

                    if (err) console.log(err);
                    status.Updated.push(obj.id);
                    console.log("Contact updated. SalesForeID: " +
                      obj.co_SalesforceID + " ContactName: " +
                      lr.isDefined(obj.co_Salutation) + " " +
                      lr.isDefined(obj.co_Name) + " " +
                      lr.isDefined(obj.co_Surname));
                  });
              }
            });

          callback(err);
        }, function(err) {
          if (err) console.error(err);
        });
      } else {
        console.log("Salesforce Connection Error!");
        status.Error = "Salesforce Connection Error";
      }
      return Promise.resolve(status);
    }).then(function(end) {

      cb(null, end);

    }).catch(function(err) {
      if (err) console.log(err);
    });
  };
  Contact.remoteMethod(
    'ImportContacts', {
      returns: {
        arg: 'result',

        type: 'string'
      },
      http: {
        path: '/importContacts',
        verb: 'get'
      }
    }
  );
};