Disqualified Directors streaming timepoint

I have successfully copied a Saturday’s disqualified directors bulk file and using the specification extracted the data.

Now, my intent is to supplement this data on a real-time, on-going basis using the streaming endpoint.
The streaming data feed apparently only contains changes for the past week.

Now, one queries the streaming data for a “timepoint” and you can only go back a week at most because
of this - querying a particular timepoint.

So, question: If I were to say copy this coming Saturday’s bulk file (disqualified directors) and then immediately
start the streaming, where I have to supply a timepoint, how would I know what timepoint to use to begin picking
up changes since the bulk file was loaded?