Hello!
The Data Table is, unfortunately, unable to live update with the dashboard, though I have requested it as a feature. In this use case, if you are looking to show the data coming in live, I would recommend using the Device State Table block within your dashboard, so you will be able to see each state come in, and will be able to order them in chronological order. The dashboard will also live-update as new states come in. Here is an example:
You can also use an Indicator Block next to your Data Table or Device State Table to show the data you would like to, as you can display data and use Context Variables within the Indicator Block.
I would recommend still using the data table to do these calculations. This way, using both the device state and data table, you will be able to show the data on your dashboard, as well as use it in calculations within a workflow.
Hopefully this helps,
Julia