This is impressive: scientists have scanned and imaged every neuron and every connection in a fly brain
. The data has been made freely available, and you can download the whole dataset, if you have 12TB of storage available.
Human brains have about a million times more neurons than a fly brain, and note also that this is morphological, rather than biochemical data, which is going to be even more complex. Adjust your expectations for mind uploading accordingly.