yeah, as @keymanpal mentions all possible - though their will no doubt be some current limits on the usb outputs - I think its around 700ma total on a rPI iirc?
so depends a little on the devices you have plugged in… usually I find things with lots of leds to be the worst 
but ive had no trouble bus powering : pico, squarp pyramid, soundplane.
(alpha/tau are fine, but they don’t really draw power)
not tested push2, but it’ll probably be ok, but it goes down into a low power mode anyway.
I think the linnstrument has a similar mode, which might help prolong battery life
bare in mind the ‘batteries’ in side the organelle-m are 4 x AA, so that might limit you on multiple high current devices - but you can use rechargeables, and also as Antonio says, you can use a USB powerbank for prolonged periods - that’s what I do.
(ive a couple of different size powerbanks, to give options on battery life vs size/weight)
my plan is to bring the organelle-m at 3e, possibly as my main hub
as for routing between devices, sure you can use pd, but you can also do it directly with alsa.
I kind of showed this in this video:
btw: if anyone has anything they want to see/know about the organelle-m let me know.
I plan to do a video this week, that covers the organelle-m , so it’d be useful to know if there are any common questions.
(the C&G was very entertaining, but I think a few want to see the real M in action etc 
)