Looking on their website, the winter timetable ends 28th March and no summer timetable has been put up yet. I would expect the new timetable up sooner than 2 weeks before it becomes valid.
Assuming you are referring to the PDF timetable, I would not be at all concerned - most airlines do not post the new PDF on their website until after the old one has expired. Further, plenty of airlines post the PDF timetable well after the validity has begun.
If you want to check whether a flight is expected to go ahead, try making a dummy booking for it on the airline website