I hope to see an active partnership with uber in the next few months, rumors have been going around since last year that companies like that (also including airbnb, lyft, ...) are already targeting certain blockchain projects. Tachain would be perfect for uber.
i dont think any partnership would come before their MVP is full out. Even then for such a huge company I think they'd want to see proof of the product working and people wanting to use it.
Partnership with such a huge brand may not be feasible, Uber already have a solid foundation and they may think of acquisition rather than partnership, so is best that the tachain team focus more on building their own foundation, once that is done, investors and partners will be the ones seeking them out, so that's why they should get this right at this initial stage