That should be sufficient to make the API request part of the process work, but depending on how you use the data returned you may need to make other adjustments as one important difference between v3 and v5 results is that in v3 the _id field is treated as an integer, where as in v5 (and the new Helix API) it’s a string.
So if you’re making use of a users ID, such as in a database or whatever, make sure that the change from an int to string isn’t going to be an issue for you.
A less important change, but still a change, is the removal of the _links object in v5, so ensure you’re not making use of that.