Unless we actually get a reference toward the Sony movies or we see Peter enter a portal to the Multiverse or something, I really don't think we should add them to the timeline.
My 2 reasons:
-First, all MCU productions are called "Marvel's X", Sony's movies don't have those.
-Second, if your reasoning is that Tom Holland's Spider-Man appears in them, that would make the Spidergeddon comics canon as well, as he appears in those too.
But as always, waiting till it actuallly happens is the best course of action.