Can a tendon/nerve still be attached back in place after 7-8weeks of waiting for surgery, and it is on the inside of my right thumb?

Yes: Nerves do not usually retract much and even if they do the gap can be bridged with a nerve wrap. If your thumb tendon retracts that might be impossible to repair.

Yes: Generally following a nerve and tendon injury repair should be done within 1 week. If there is delay, the nerve is easily repaired usually after removing the neuroma that generally forms at the site. As for the tendon, 2 months after injury can be difficult. It can be done, but generally it is performed with a tendon graft taken from your wrist or leg. Sometimes multiple surgeries are required.