A good recovery tool typically offers two levels of scan- a quick scan and a much longer detailed scan.

The latter scan should list files and file fragments with the probability of recovery (e.g. has one of more clusters comprising the file been overwritten).

If the partition in question has been actively used since the files were deleted, there is a significant chance of corruption and loss.

Data recovery at this level is a bit of a last chance saloon, and no substitute for a backup.

The best free file recovery software 2019 | TechRadar
10 Best Free Data Recovery Software [Undelete Files In 2019]
20 Free Data Recovery Software Tools (March 2019)