Onfleet provides the software various companies use to manage their delivery tasks and drivers. If you received an SMS Message asking to opt-in for Delivery Updates, that means that the company with which you placed an order wants to send you updates regarding your delivery. These updates usually include tracking links and/or estimated delivery times.
If you need more information about the specifics of your delivery, you will need to contact the organization responsible for your delivery. The easiest way to get in touch with them is by calling or texting the phone number used to send you notifications about your delivery status once you've accepted to receive updates or by other means of contact you might have.