I'd supervise all interactions, period. I do think they will eventually play with the puppy, it just will take time for them to warm up to the idea.
I just got a puppy this weekend - distant relative of my shepherd. Katsu, my female shepherd, started off not really giving the puppy much attention. He'd lick her face and she would just allow it before moving away. Now she play bows and jaw spars, tugs, chase/be chased with him gently. I'm happy with her interactions.
My shiba is a bit harder to read. He's 3.5 years old but acts about 10. He will go between jaw sparing/playing with the puppy one moment to being snarky the next. I do my best to limit the puppy's interactions with him just in case.
For taking things, I usually correct the puppy (nuh-uh), give the object back to the older dog and redirect the puppy to something else (yes). The only dog really possessive in my household is the shiba and he tends to be less so the longer a new dog is in the house (I've watched dogs for over a week in my home with him).
+ Kalbi CGC 6/21/2015
+ Blackthorn's Out of the Frying Pan NW1 ORT SEN SCN BCAT SIN RATN TKN (Katsu) 9/12/2017
+ Blackthorn's Skofnung CGC TKN RATI RATO (Steel) 07/23/2018