Unfortunately, all the recent orders that are still Late May - June will switch to Late June - July, or Early July - July if they haven't already.
Mine stayed Late May - June for many days after others who ordered well before me were switched to Late June - July.
Your are not sent any notification per se, go on the Tesla website, log in and your car will show and the dates will have changed (or change soon). I have inside friend at Tesla, late 1400 series VINS are Mid June at best (to early July currently, but could change again). None will be late May - June.