master ysposho@flare:~/magento2$ grep -inr . -e "Expected Delivery" --exclude-dir=var --exclude-dir=pub
./vendor/tig/postnl-magento2/view/adminhtml/email/track_and_trace.html:39:                                        <b style="font-weight: normal; font-size: 14px; ">{{trans "Expected Delivery"}}</b><br/>
./vendor/tig/postnl-magento2/Setup/V110/Schema/InstallOrderTable.php:55:        $this->addText('expected_delivery_time_start', 'Expected delivery time start', 16);
./vendor/tig/postnl-magento2/Setup/V110/Schema/InstallOrderTable.php:56:        $this->addText('expected_delivery_time_end', 'Expected delivery time end', 16);
./vendor/tig/postnl-magento2/Setup/V110/Schema/InstallShipmentTable.php:59:        $this->addText('expected_delivery_time_start', 'Expected delivery time start', 16);
./vendor/tig/postnl-magento2/Setup/V110/Schema/InstallShipmentTable.php:60:        $this->addText('expected_delivery_time_end', 'Expected delivery time end', 16);