Please follow my prerequisite blog to add the jQuery dependency on the master page. The below jQuery code will work with jQuery dependency.

SharePoint people profile will have all the details about the peers and the manager. The below jQuery code will call the REST api to get all the peers and the manager and display in the html tag.

The below code uses the addition javascript reference /_layouts/15/sp.UserProfiles.js for the profile api

You can also download the full code from the Github

$(function () {
    GetMyTeamDetails();
});

function GetMyTeamDetails() {
    var siteUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/SP.UserProfiles.PeopleManager/GetMyProperties";
    console.log(siteUrl);
    $.ajax({
        url: siteUrl,
        headers: {
            Accept: "application/json;odata=verbose"
        },
        success: function (data) {
            try {
                var peers = data.d.Peers.results;
                for (var i = 0; i < peers.length; i++) {
                    $("#peers").append(peers[i]);

                } // end of for loop

                var managers = data.d.ExtendedManagers.results;
                for (var i = 0; i < managers.length; i++) {
                    $("#manager").append(managers[i]);
                } // end of for loop
            } catch (err2) {
                alert(JSON.stringify(err2));
            }
        },
        error: function (jQxhr, errorCode, errorThrown) {
            alert(errorThrown);
        }
    });
}