Contemporary Amperex Technology Co., Limited (CATL), the largest battery manufacturer in the world with a 38% share of the global market, has just announced some fairly significant breakthroughs in battery tech that aren't just theoretical; they're already hitting the market.
Ionity has 300kW chargers in Spain but there are pretty rare. 50kW-100kW is most common here. Rolling out 1MW network will be very slow due to all the infrastructure it requires and judging by the prices of 150kW chargers, charging at 1MW speeds will probably be more expensive than gasoline. But in the end that’s the only way to actually replace gasoline cars so they will have to build it eventually. My guess would be 10-15 years before you can reliably (as in network big enough that you can easily find working chargers) charge at those speeds.