This evening after 7p, I encountered the TFR/NOTAM notice in DJIGo4 for this year's Seafair Blue Angels airshow over Lake Washington. So, I visited the FAA NOTAM page to understand NOTAMs and TFRs better,
8/4619 NOTAM Details
I was happy to learn the 5 nautical mile TFR, centered over the I-90 Lake Washington bridge, is actually only in effect 1p to 3p, during Blue Angel's performances each day (this year, Aug 2 thru 5, 2018).
Since it was 7pm and DJIGo4 presents this as an "Authorization Zone", not a no fly zone, I performed a quick unlock, verifying my DJI account with my mobile #, and had a lovely, safe sunset FPV flight nearby my home.
Upshot: DJI's excellent "GEO" feature apparently doesn't yet have the capability to present TFRs based on their actual "effective date" and times, but rather just on overall start/end of a NOTAM.