We haven't implemented this yet as there are a number of possible timestamps, and the usefulness of each would depend upon what you are trying to achieve.
The scopes do not have any clock functionality so probably the most useful timestamp of all is not possible to achieve at the present time, that is the actual time of each waveform capture to the scopes internal memory.
Our Windows software will timestamp each waveform buffer with the time that the aggregated data was read from the device to the applications memory. This works at second resolution as a higher accuracy has no particular purpose when two identical setups running at the same time, would come up with different values due to the random effects of the underlying operating system. So using the timestamps to give accurate timing information between buffers would not be possible.
The final timing is related to the file writing of all the data to disk when using FIle->Save, or File->SaveAs, and this appears in the file information.
What timings are you specifically looking for ? and what would you hope to achieve using this information ?