I am at 74 Days since eCOPR, (Jan 18th)
I have been to mexico and hawaii, both times the airlines didnt ask for any paperwork (UK Passport), so no issues flying and returning without PR Card.
Border agent in Vancouver asked for my PR Card after the Mexico flight, Told him there is an epic delay, he was like oh OK, that was it.
Cant say you will have the same experience as me, but I have had no issues travelling without the PR Card.
I am now in the USA for 3 weeks via Peace Arch, no need to go into border office at the USA and will update you on the way back how my land border crossing goes, but that is even stated as not an issue.
Good luck everyone, I dont see getting this PR card anytime soon, Wait times are now 47 Days on the site and just keep going up.
I called them multiple times only to speak to more clueless people. Might have to contact my local MP soon.