Timing of CBC Election Call

On October 19th, when will CBC announce which party they project to have won the federal election?
Before 23:00 EDT: 40%
Between 23:00 and 24:00 EDT: 40%
After 24:00 EDT: 20%
(The initial announcement is what matters for this question, even if it is latter rescinded.  CBC does not need to specify what type of government (e.g. minority or majority), just the winning party.)

The Liberals are projected to win the federal election tomorrow, by 140 seats to the Conservative's 120 (according to 308, see here).  The polls close at 21:30 EDT in Ontario, and at 22:00 EDT in BC.  It seems likely that enough results will come in for the CBC to project a winner an hour or so after the last poll closes.  However, if the race is very close, they might not project a winner until after midnight.