Season 3 starts with episode 39, which aired in Japan on April 7, 2018.
The most recent additions will have an '*' by them.
Episode 39 Episode 40 Episode 41
Episode 42 Episode 43 Episode 44
Episode 45 Episode 46 Episode 47
Episode 51 Episode 52 Episode 53
Episode 54 Episode 55 Episode 56
Episode 63 marks the end of the 3rd season, but good News! To be continued 4th Season. Hopefully, we won't have to wait too long. I'll be keeping up by reading the manga!