Im really hoping the Premiers now start closing businesses and shut stuff down.

It depends on the province. Quebec is almost completely on lock down at this point. I think the decentralized approach is better in this case since it allows for much more agility and a localized approach. The provincial government here is communicating extremely well with the population and answers really well to most concerns from the population. To give an example they opened today daycares for the children of healthcare workers to avoid any disruption due to all schools shutting down. Which is an excellent comprise that I don't the federal government being able to set in place so quickly and so widely across the whole country

Because that's not the federal government's problem. They are mostly interested in: international relations, facilitating business and the economy (trade deals etc), making sure shipping flows freely, defence, etc (you can find a list of all provincial vs federal competencies online). The healthcare systems are run by the provinces, even if the federal government took the liberty to redistribute tax monies to provinces for their own healthcare, subject to federal govt conditions, as well as assure service to some populations (first nations, veterans, etc).

Trudeau has even stated that he thinks each province should be acting on that since they're competent wrt healthcare. Borders are under his control, yet weren't seen as a particularly pressing issue as I highly doubt (as we have, I believe, clearly seen) that this was even on his daily agenda before a few days ago. He went from 0 to 100 in a day. Just yesterday he was serving the same old same old.

There were a bunch of statements made by some of his ministers on Twitter. Overall bad handling of what should have been a no-brainer. Premier Legault had to publically call Trudeau out multiple times on his inaction. That kind of thing shouldn't happen.