If you are messaging another MySudo user, there are three different delivery status updates (Read Receipts):
Black ✔️: message is on its way
White ✔️: message has reached contact's device and contact has not read message
Two ✔️✔️: contact has read your delivered message
Please note: There are no message status updates available if you are messaging a non-MySudo user.
*See "How to enable/disable Read Receipts for messaging" for more information.