Not seeing any polls since the referendum was announced. Most recent poll from April had 43% for statehood, 21% for status quo, 15% for independence, 14% for free association, 7% for undecided.
The polling has been goofy. The ballot measure will only ask whether PR should become a state: yes or no. These other options are not on the ballot. Presumably pro-independence voters all would vote No, but free association supporters and even status quo/territory supporters probably would do the same because neither of these options aligns with statehood. This indicates to me that Yes is far from assured and if anything would barely eke out a majority.