There's no definite timeline for production turnaround when it comes to a film or series. So, for example, despite the fact Slow Horses starring Gary Oldman (The Dark Knight, Darkest Hour) was initially confirmed to be heading to Apple TV+ in November of 2019, we still haven't been able to watch the series. Despite the fact other shows and films have been announced and launched between then and now.
Watch the official trailer for the upcoming Apple TV+ series ‘Slow Horses’ starring Gary Oldman