Any chance the Narrows will open up tomorrow?

They close the Narrows for 24 hours when the flow rate is above 150 cubic feet per second (CFS). You can look up the real-time Narrows CFS at https://waterdata.usgs.gov/ut/nwis/uv/?site_no=09405500&PARAmeter_cd=00065,00060,00010,00095,72020. Regardless, before tackling the Narrows you should check-in at the visitor center. The best time to hike the Narrows is in June.

Best bet is to call the visitor center. They'll have the most up to date info