So looks like this is finally a thing, and not just the Japanese/Chinese special meals that were argued about the last 5 pages LOL
https://thepointsguy.com/2017/10/delta-pre-order-meals/
Entree per-ordering will be available in Delta One business class on select routes beginning in early 2018, initially only on outbound flights departing from Atlanta and New York. A few months later, Delta will add the feature to all international Delta One flights, including those originating overseas. Finally, by the end of 2018, all Delta One and domestic first class customers will have the ability to pre-order meals.
It is only 6 days in advance compared to 30 for AA, but I think 6 days in plenty of time, they will also send a text to ask if you don't respond to email on ordering.
I have a D1 flight out of JFK in early 2018, look forward to trying it out.