@ralle14 did you join already as well ?
Yup, I joined last week and made a mistake in picking the Eagles to cover in the match earlier today. 
Since I've already submitted my week 1 prediction, I’d like to see other players picks just like on Superbru where you can view other players pick after submitting your picks.
Is that possible on the Sleeper app too?
Unfortunately, it's not possible because the mechanics on the Sleeper app aren't similar to Superbru, where you can submit or lock your picks ahead of time. Is that possible on the Sleeper app too?
The only way to see what the others have picked is to wait it out until the match is live.