With some exceptions, PM EMHs are still regularly scheduled at MK, typically each Wednesday (along with an AM EMH on each Friday).
There have been recent examples of times where PM EMHs have not been offered for short periods - October 2019 being an example - where none were offered the entire month (they offered 2 AM EMHs per week instead). There are a few weeks this winter / spring where the Wednesday PM EMH has been swapped for an AM EMH - such as 2/5, 3/11, 3/18, 5/13 - but the rest of the weeks have the more or less "normal" Wednesday PM EMH scheduled. Note that sometimes various events/holidays shift around the "normal" EMH scheduling in any given week.
As for the park calendar, they keep a pretty bare bones calendar until around a month out, then we'll typically see an update to select parks depending on the time of year. This often occurs around the second week of the month prior.
While past performance isn't always indicative of future results, looking at last year's hours for your dates can sometimes be a helpful guide in predicting what final hours may end up being.
Hope that helps!