A peer figured this out so I am answering in hopes to benefit others.
Include the following classes and handle dependency injection in _constructor.
use Magento\SalesSequence\Model\ResourceModel\Profile;
use Magento\SalesSequence\Model\ResourceModel\Meta;
Here is function to get prefix:
/**
* get Order prefix
*/
protected function getOrderPrefix()
{
try {
$metaId = $this->_meta->loadByEntityTypeAndStore('order', $this->_storeManager->getStore()->getId());
} catch (\Exception $e) {
$this->_logger->critical(
sprintf("[%s]: Meta not found for Order prefix.",
strtoupper($this->queueType)
)
);
return;
}
try {
$collection = $this->_profile->loadActiveProfile($metaId->getId());
} catch (\Exception $e) {
$this->_logger->critical(
sprintf("[%s]: profile not found for Order prefix.",
strtoupper($this->queueType)
)
);
return;
}
return $collection->getPrefix();
}
cheers!!