Anything outside the stations has no impact on the line opening date. Road work is one of the last thing to be done that only effect surface traffic. If there is sidewalks work around the station once its in service, entrance will be open with limited access until the work is done.
What we can't see is the work inside of the stations themselves with Kennedy being the last one as well Yonge to be fully completed. The rest should be completed by now or needing small amount of finishings touchup.
As noted, Yonge could be a problematic station as somethings have not worked out as plan or have gone south. Until Yonge is completed, the line will not open even for bypassing it.