Do you really think that's realistic? Both Red Bull and Ferrari are way in front of them in reality, and I would say over the races we have seen so far Merc is slightly in font too.
I think the very best they can do for now if fight for third slot.
Plenty to be happy about when you consider they think the break problem is fixed and proposing is not too bad, nibbling away grabbing points here and there will all add up at the end of the year for them, but I don't think it likely that both Merc and Red Bull will not improve along with Mclaren, so it will probably be a see-saw of one being better this week and not as good the next.
I hope they will be in there, but don't be too disheartened if they are not, it will not be an easy job