On my 2015 CForce 500, it runs normally at 3 bars. 4 bars and the fan kicks in to bring it back down to 2-3 bars.
On the hottest of hot days and working it hard I've seen it get to 5 bars.
In my experience if it goes above 5 you have some sort of issue. Either your water pump is leaking (check for coolant coming from the weep hole) or your fan isn't kicking in. I would say if you're still able to run it sounds like the fan isn't working or the switch that kicks it in doesn't.
I've replaced the water pump 2 times and when it starts weeping it doesn't take long for it to get up to the top of the guage. I've never run it when it got to the top, ended up in one case had to be towed out as with the heat on the day it was not cooling down at all to be able to limp it back out.