For some reason I thought the lockdown had started sooner, around March 1 or 2 instead of March 9 when it actually occurred. I found an
article showing cases in Lodi (locked down Feb 24) vs Bergamo (no lockdown until Mar 9), In Lodi, the lockdown seems to have reduced R0 to approximately 1, with linear growth instead of exponential growth since then. That's good, but they're really going to have to get to substantially less than 1 for this to subside in a reasonable amount of time, as will everyone else of course. The more restrictive lockdown recently imposed in Lombardy might help bring R0 enough below 1 though. I do expect at least a reduction in the rate of new case detection in the next week but I don't know that the prevention of disease spread in Europe or the US is going to be anywhere near as effective as in most of East Asia, at least until the number of cases is far higher still.