app/overrides/spree/admin/shared/_order_summary/add_order_exported_at.html.erb.deface
<!-- insert_bottom '#order_tab_summary .additional-info' -->
<% if @order.exported? %>
<dt data-hook='admin_order_tab_date_exported_title'><%= Spree.t(:date_exported) %>:</dt>
<dd id='date_complete'><%= pretty_time(@order.exported_at) %></dd>
<% end %>