Incredible that's it's still going and it seems to be getting stronger.
Have any.kre cracked appeared along the shelf where it was predicted could be a.potential.mega disaster?
No - some small cracks due to the earthquakes but nothing out of the ordinary, a couple of minor landslides but completely detached from any flank collapse. It would take an earthquake with more than 1000x the energy of what normally happens in that region (depending on study a minimum of 7.8 or 8.0 which happened to be in the right place) or a really big eruption 50+ times the size of this one for something like this to potentially trigger a massive flank collapse - and even then it doesn't mean it would happen in a way which produced a massive tsunami.
There has been some movement of the flank detected but it is fairly limited.
There is a chance that lava streams entering the sea could build up to produce formations over the deeper water eventually collapsing causing a small to medium local tsunami but due to the nature of the coastline only a small number of locations on the island would be threatened by it.
EDIT: I would never say never though - there is general instability and the potential there - despite the evidence being stacked against it the possibility is there but as is often the case downplayed.