You're right, as usual Kiwi. Here's the world clock. https://www.timeanddate.com/worldclock/ Doesn't matter though. It's in Vegas. Regardless, they are JUST starting the bottom of the undercard with the two women, with about 6 bouts to go before the main event. So like you said, it might be closer 4-5PM. Here's the card: Stevens and Crews are currently fighting.
T-Mobile Arena, Las Vegas, Nevada, USA view event
Light Heavyweight Sergey Kovalev 30 0 1 S Andre Ward 30 0 0
WBA Super World light heavyweight title
IBF World light heavyweight title
WBO World light heavyweight title
Light Heavyweight Isaac Chilemba 24 4 2 S Oleksandr Gvozdyk 11 0 0
NABF light heavyweight title
Super Lightweight Maurice Hooker 21 0 2 S Darleys Perez 33 2 1
WBO NABO super lightweight title
Middleweight Curtis Stevens 28 5 0 S James De la Rosa 23 4 0
WBC Continental Americas middleweight title
Middleweight Bakhram Murtazaliev 6 0 0 W Botirsher Obidov 6 0 1 TKO
Super Featherweight Tyler McCreary 11 0 0 W Vincent Jennings 5 2 1 MD
Heavyweight Brice Ritani Coe 4 4 1 S Darmani Rock 5 0 0
Super Lightweight Sonny Fredrickson 14 0 0 W Gabriel Duluc 11 1 0 UD
Middleweight Meirim Nursultanov debut W Henry Beckford 4 5 0 UD
Super Middleweight Claressa Shields debut S Franchon Crews debut
T-Mobile Arena, Las Vegas, Nevada, USA view event
Light Heavyweight Sergey Kovalev 30 0 1 S Andre Ward 30 0 0
WBA Super World light heavyweight title
IBF World light heavyweight title
WBO World light heavyweight title
Light Heavyweight Isaac Chilemba 24 4 2 S Oleksandr Gvozdyk 11 0 0
NABF light heavyweight title
Super Lightweight Maurice Hooker 21 0 2 S Darleys Perez 33 2 1
WBO NABO super lightweight title
Middleweight Curtis Stevens 28 5 0 S James De la Rosa 23 4 0
WBC Continental Americas middleweight title
Middleweight Bakhram Murtazaliev 6 0 0 W Botirsher Obidov 6 0 1 TKO
Super Featherweight Tyler McCreary 11 0 0 W Vincent Jennings 5 2 1 MD
Heavyweight Brice Ritani Coe 4 4 1 S Darmani Rock 5 0 0
Super Lightweight Sonny Fredrickson 14 0 0 W Gabriel Duluc 11 1 0 UD
Middleweight Meirim Nursultanov debut W Henry Beckford 4 5 0 UD
Super Middleweight Claressa Shields debut S Franchon Crews debut