Recent era tradition for majority governments in Canada is to prorogue parliament roughly halfway through a 4-year mandate in order to start a second session with a fresh throne speech.

The obvious time to do this for the Trudeau Liberals would be after the summer break, likely Sept. 18th, the first day that the House sits.  What that would mean is that any legislation that has not yet received royal asset by the June 23rd, the last day before the summer break, would die on the floor.

Obviously the Liberals are not required to prorogue parliament at that time and they could certainly wait until after the Christmas break to start a new session, but either way they are running short on time if they follow recent-era tradition.