Some time between Jesus resurrection and the appearance as angel.
The First Resurrection is not starting after the Second Coming, it has already started with Christs resurrection, and is ongoing.
Matthew 27:52-53
52 And the graves were opened; and many bodies of the saints which
slept arose,
53 And came out of the graves after his resurrection, and went into
the holy city, and appeared unto many.
Mosiah 15:21-22
21 And there cometh a resurrection, even a first resurrection; yea,
even a resurrection of those that have been, and who are, and who
shall be, even until the resurrection of Christ—for so shall he be
called.
22 And now, the resurrection of all the prophets, and all those that
have believed in their words, or all those that have kept the
commandments of God, shall come forth in the first resurrection;
therefore, they are the first resurrection.
D&C 138:50-52
50 For the dead had looked upon the long absence of their spirits
from their bodies as a bondage.
51 These the Lord taught, and gave them power to come forth, after
his resurrection from the dead, to enter into his Father’s kingdom,
there to be crowned with immortality and eternal life,
52 And continue thenceforth their labor as had been promised by the
Lord, and be partakers of all blessings which were held in reserve
for them that love him.
