Here are the things I have added to odoo templates - REPORT / PICKING
<div class="col-xs-3">
<strong>Customer Order Number</strong>
<p t-field="o.sale_id.client_order_ref"/>
</div>
<div class="col-xs-3">
<strong>Estimated Delivery Date:</strong>
<p t-field="o.min_date" t-field-options='{"format": "d MMMM y"}'/>
</div>
<div class="col-xs-3">
<strong>Todays Date:</strong>
<p t-esc="time.strftime('%d %B %Y')" />
</div>
<div class="col-xs-2">
<strong>Our Ref:</strong>
<p t-field="o.origin"/>
</div>