You should be able to plant later in the month, but, if you're just going to get rhizomes, you will probably be disappointed. First, the success rate from chunks of rhizome can be pretty low (like 1 in 4). Second, it will take a couple of years to get modest growth, and it will probably be at least 5 years before the bamboo is even 4-5' tall. If you want a privacy hedge in less than 5-10 years, you're going to have to start with some real plants.

OK - good to know! If rhizomes are planted, how long does it take for them to begin shooting growth?
Thanks!

Shooting of actual culms may take several years. You might get some bushy growth a couple inches high this year or next, but don't expect miracles from rhizome cuttings.