Hi @vinayak_bluerobo, welcome to the forum 
It’s a little unclear what you’re asking about here, as the telemetry and video stream don’t really have delay requirements, although understandably if there’s large delay in the readings then control becomes harder.
There are some failsafes, where the autopilot will send warnings or disarm if there are excessive periods without input from the pilot / heartbeat messages from the control station software, but they’re also not strictly required, and the timeouts are user-configurable.
If you’re interested in your current message rates then you can look at MAVLink2REST in the BlueOS Available Services page. Note that several messages are requestable at a rate decided by you, including as part of various stream groups (controllable by SRn_* parameters in the autopilot).
Please feel free to clarify what you’re asking about if this doesn’t answer your question