CS / CK Dates for "Match Day 2020"
To have your scores back in time to apply in the first wave of the Match which opens in September 2019 with a Match day in March 2020, you should schedule to take your exams by the following dates:
Step 2 CS
| For examinees who test from: | The scores will be reported between: |
| May 19th - July 13th 2019 | August 14th - September 11th 2019 |
| July 14th - September 7th 2019 | October 9th - November 6th 2019 |
Key to success: To insure that your scores are available, you should plan on getting the CS done by July 13th 2019 if possible.
Step 2 CK
For step 2 CK the scores are generally reported within 4 weeks, so you can take it as late as mid August and still have the scores available for the opening of the match. Since there are often delays in reporting during this busy time, it best to be safe and get your exam done by the end of July!
Key to success: Since the CS is harder to schedule and takes longer to get the scores back, it's sometimes better to get the CS done first and then battle the CK.
Summary:
Get CS done by July 13th 2019!
Get CK done by end of July (best) or the latest by August 15th 2019!
Key to Success: Getting Great Scores is the ultimate key to opening doors. So take it when you are the most prepared and likely to get your best scores!!! 
Source: ECFMG.org and USMLE.org
Thanks to Dr. Gibu George