Endless Roll and Baby Mode will be released together in an update on the last friday of the month, on 28.02.2020, around early evening in the European time zone. This means the update should be available around the noon in America and late night in Australia / Asia.
If you've missed the news, you can read up on Endless Roll here:
Endless Roll Announcement
And here you can find more information regarding Baby Mode:
Baby Mode Announcement
The wait is almost over.