It does take a while before TMC shows up on mine in the dial centre.I have the MK4.5 with the NAV unit and was surprised when it routed me around an incident, I expected to have
to link it to my phone or stick a sim card in etc.
Although its a little slow sometimes. Hit the traffic and come to s standstill then it chimes in with a warning
traffic ahead... Grumbles and cuss words about yes I know I am sitting in it.
But it could also be an accident that has literally just happened?
Once that is on if i am going a fair distance it recalculates the journey time many times.
I tend to turn the "Dynamic" feature off because i tow a Caravan and don't want to be sent on inappropriate roads
But it is useful to see the time change which helps decide when to take a break
The Trailer option and setting your own road speeds is really useful too