It does say 3 PM on the twitter. Here https://www.whitehouse.gov/live/ it shows as 3:30 EST or 2:30 central. Either way that is 30 minutes from now.
POTUS_Schedule 🇺🇸 on Twitter: "UPDATE - Monday, 28 January 2019 THE WHITE HOUSE Office of the Press Secretary
Press Briefing Schedule - White House Briefing Room 3:00PM Press Briefing - with Sarah Sanders
#POTUSSchedule #POTUS #WhiteHouse #WestWing #BuildAWallCrimeWillFall #BuildTheWallCrimeWillFall… /IfbMg9ZERQ"
[–] 16431534? 0 points 3 points 3 points (+3|-0) ago
3:30 PM and they are always late. LOL