It seems that it was canceled, I do not know why it would be since there is good weather, but I also only saw this once, I still do not see another source say the same...https://twitter.com/AmericaSpace/status/1369435777541828615
The #Starlink V1.0-20 launch for Mar 10 at 0300 UTC was scrubbed. CelesTrak has updated pre-launch SupTLEs for the new launch time on Mar 11 at 0813 UTC and a deployment time of 09:18:02.320 UTC: https://celestrak.com/NORAD/elements/supplemental/
Now targeting Thursday, March 11 at 3:13 a.m. EST for launch of Starlink – taking some additional time for pre-launch checks