What happens if it seems to be stuck? the file count hasn't changed in at least 45 minutes.

Colanero wrote:

During File Migration, What happens if it seems to be stuck? the file count hasn't changed in at least 45 minutes.

Times and file count have always been a bit flakey...

It can take some time

If you are truly stuck, start over.

The most trouble free way to move to a new machine, is using the Setup Assistant on the initial boot of a brand new machine— you have one shot here. https://support.apple.com/en-us/HT205749

The second best way is use the Migration Assistant.

How to move your content to a new Mac https://support.apple.com/en-us/HT204350

wait as long as you can, then cancel it and see how far it got. It might have finished and just gotten lost while cleaning up.

If it only got part way through, it may have choked on a particular file, or the source directory may have an issue that could be repaired with Disk Utility RepairDisk/FirstAid.