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Adler, the P.1101V1 was not completed by the end of Apr '45. It was still many, many months away from production and still had to be test flown. The Americans even thought of having the Germans finish the a/c for them, so they did not have to.
Did I give an exact date that the P.1101 was going to test fly? Nope sure did not. However it was closer to test flight than the Ta-183 and the Ta-183 was scheduled to fly May/June 1945.