Set or determine OT distribution injection pump VW LT 2 2.5TDI

Hello together! What it looks like the timing belt has slipped over from the ESP, because the tensioning roller was not really tensed. When we found the error the roll has solved itself to the extent that the belt has jumped over clearly more than 2-3 teeth. Is there a possibility to read the OT from the pump? Or is this only possible with the help of a measuring clock? VCDS would also be available but will not bring me anything as long as the engine does not start, wouldn’t it? Would I be happy about any tips!