Qatar Airways have adjusted most of their S20 schedule.
Some routes would go according to the planned schedule, some are paused until October ( W21 season ).

For routes to Turkey;

IST - x1 daily after 5 June, x2 daily ( normal ) from 1 July
SAW - Cancelled entirely for the S20 season
ESB - Cancelled entirely for the S20 season
ADB - Cancelled entirely for the S20 season
ADA - Cancelled entirely for the S20 season
AYT - Seasonal route cancelled , would not operate in S20
BJV - Seasonal route cancelled , would not operate in S20
TZX - Seasonal route cancelled, would not operate in S20

I pretty assume that Airlineroute would post something about the QR schedule for Summer 2020.