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Standard message queue is based on Cron jobs. By default Salesforce cron generate schedules Every 1 minute.
For magento Cron installation refer to “Magento 2 CRON Setup“ article
How to enable Salesforce Standard Message Queue in Magento:
Go to Magento Admin panel - click Salesforce (on left side bar) - General Configuration - Advanced tab
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RabbitMQ message queue is
How to enable Salesforce RabbitMQ Message Queue in Magento:
Go to Magento Admin panel - click Salesforce (on left side bar) - General Configuration - Advanced tab
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