The Samsung Galaxy Fold was supposed to see an official release tomorrow (April 26, 2019). However, as many of us know by now, teething problems uncovered by reviewers has postponed the launch of this next-gen smartphone. A tweet allegedly referencing an AT&T email suggests that it will now take place in June.
https://www.notebookcheck.net/Leaked-email-hints-at-new-Samsung-Galaxy-Fold-release-date.419294.0.html
I imagine if Huawei has similar display QC issues they'd just hand pick the review units and go on with the launch regardless, then further take months to actually ship to solve the screen issue and claim a 1st as they always do.