It seems like the second block has been mined aswell looking at this :
http://xtnodes.com/xt_blocks.php , when we are supposed to upgrade to XT though ? I know it's on January and stuff however do we need 75% nodes running or we need 750 block mined from 1000
You can change now if you want, fork is only triggered if those conditions are met, if they don't, nothing happens.