So unless there are any crashes/mechanical issues, Max is totally going to walk this race.
Unfortunately, I think that he's going to win the championship easily unless McLaren can do something even more with upgrades. Even if the McLaren is nipping at the heels of/is as fast as the RB, Max's talent and championship lead will mean he will still win it. The McLaren has got to be consistently a good few tenths faster than the RB for Norris to stand any chance of the WDC this year.
The WCC championship is interesting though. McLaren are starting to look at least like the 2nd fastest car, and the Merc and Ferrari are fast enough and have stellar driver lineups to mean that Perez's total incompetence could see him finishing in the bottom half of the points most races.
If McLaren can keep getting 2nd and 3rd and can snatch wins here and there, whilst Perez languishes in 7th or 8th, things could get interesting. They still might need 1 or 2 DNFs for Max too though..