Recently Diagnosed with T4BN2 Rectal cancer that has spread to colon.

I am having a PET scan in a couple days have have already been noted to be T4BN2 with my recurrence after resection done 9 months ago. I did not have chemo or radiation last time around. Can anyone let me know what I should be expecting and length of treatment for a similar diagnosis. My tumor is "microsatellite stable" (MSS) moderately differentiated invasive adenocarcinoma,.