Yesterday we found out that My Time at Portia was going to hit the Switch in Japan on April 16th, 2019. Today it looks like that date is going to be the worldwide release as well. Switch eShop regions around the world are showing April 16th, 2019 as the release date, and the option to preload is now live. There will most likely be an official announcement of this news from Team17 later today.
Switch eShop listing shows My Time at Portia releasing in NA/EU on April 16th, 2019, preload now live
The time is next month, apparently