Around 11 p.m., perhaps

• Not quite on time
• Nearing bedtime
• Somewhat behind schedule
• Prince keeping model up quite long into the night
• Not exactly on time
• Rather behind
• Close to midnight, say
• A little tardy
• Rather tardy

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Latish \Lat"ish\, a. Somewhat late. [Colloq.]