The Jet engines were delayed by a year by the need to develop low
nickel and chrom alloy usage engines. (Essentialy the Jumo 004A to
Jumo 004B was a conversion of materials). The important Heinkel HeS
011 engine was however meant to not require any strategic materials at
all. Ernest Heinkel wasted much of the engineering talent available
to him by dispersing it in all sorts of parrallel developments such as
ducted fans that distracted development of jet engines.

The HeS011 would have likely not have panned out in any case and other
more promising designs, like the 006, ran afoul of bureaucratic and
personal bias. Probably the greatest self-inflicted handicap the Nazis
had was its clumsy centralized socialist bureaucracy which was further
compromised by being thoroughly corrupt.