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A blog from 2020 seems to say that the timings are the same:
Below is the Yangon circular train schedule for both directions (you can choose any of them). Please keep in mind that this timetable is not always accurate and the circular train can be late.
6.10 AM (RIGHT/LEFT)
8.20 AM (RIGHT)
8.35 AM (LEFT)
9.30 AM (RIGHT)
10.10 AM (RIGHT)
10.45 AM (LEFT)
11.30 AM (RIGHT)
11.50 AM (RIGHT)
12.25 PM (LEFT)
1.05 PM (RIGHT)
1.40 PM (LEFT)
2.25PM (RIGHT)
3.30PM (RIGHT)
4.40PM (LEFT)
5.10PM (RIGHT)
Another provides a similar answer:
The Yangon Circular Train departs daily from Yangon Central Railway Station from 8:30 am and departs every 45 minutes to an hour, from platforms 6 and 7.