diff --git a/addons/purchase/report/purchase_report.py b/addons/purchase/report/purchase_report.py
index ca01fb92f5a..e6ef3db5522 100644
--- a/addons/purchase/report/purchase_report.py
+++ b/addons/purchase/report/purchase_report.py
@@ -34,8 +34,9 @@ class PurchaseReport(models.Model):
     company_id = fields.Many2one('res.company', 'Company', readonly=True)
     currency_id = fields.Many2one('res.currency', 'Currency', readonly=True)
     user_id = fields.Many2one('res.users', 'Purchase Representative', readonly=True)
-    delay = fields.Float('Days to Confirm', digits=(16, 2), readonly=True, help="Amount of time between purchase approval and order by date.")
-    delay_pass = fields.Float('Days to Receive', digits=(16, 2), readonly=True, help="Amount of time between date planned and order by date for each purchase order line.")
+    delay = fields.Float('Days to Confirm', digits=(16, 2), readonly=True, group_operator='avg', help="Amount of time between purchase approval and order by date.")
+    delay_pass = fields.Float('Days to Receive', digits=(16, 2), readonly=True, group_operator='avg',
+                              help="Amount of time between date planned and order by date for each purchase order line.")
     avg_days_to_purchase = fields.Float(
         'Average Days to Purchase', digits=(16, 2), readonly=True, store=False,  # needs store=False to prevent showing up as a 'measure' option
         help="Amount of time between purchase approval and document creation date. Due to a hack needed to calculate this, \
diff --git a/addons/purchase/tests/test_purchase_order_report.py b/addons/purchase/tests/test_purchase_order_report.py
index 8b38611373a..42e78b51873 100644
--- a/addons/purchase/tests/test_purchase_order_report.py
+++ b/addons/purchase/tests/test_purchase_order_report.py
@@ -3,7 +3,7 @@
 from odoo.addons.account.tests.common import AccountTestInvoicingCommon
 from odoo.tests import Form, tagged
 
-from datetime import datetime
+from datetime import datetime, timedelta
 
 
 @tagged('post_install', '-at_install')
@@ -66,3 +66,25 @@ class TestPurchaseOrderReport(AccountTestInvoicingCommon):
         self.assertEqual(res_product2.qty_ordered, 1.0, 'No conversion needed since product_b is already a dozen')
         # report should show in company currency (amount/rate) = (200/2)
         self.assertEqual(res_product2.price_total, 100.0, 'Currency conversion is not working')
+
+    def test_01_delay_and_delay_pass(self):
+        po_form = Form(self.env['purchase.order'])
+        po_form.partner_id = self.partner_a
+        po_form.date_order = datetime.now() + timedelta(days=10)
+        with po_form.order_line.new() as line:
+            line.product_id = self.product_a
+        with po_form.order_line.new() as line:
+            line.product_id = self.product_b
+        po_form.date_planned = datetime.now() + timedelta(days=15)
+        po = po_form.save()
+
+        po.button_confirm()
+
+        po.flush()
+        report = self.env['purchase.report'].read_group(
+            [('order_id', '=', po.id)],
+            ['order_id', 'delay', 'delay_pass'],
+            ['order_id'],
+        )
+        self.assertEqual(round(report[0]['delay']), -10, msg="The PO has been confirmed 10 days in advance")
+        self.assertEqual(round(report[0]['delay_pass']), 5, msg="There are 5 days between the order date and the planned date")