Questions & Answers about Сегодня мы едем на ферму за город.
Russian distinguishes between going by transport and going on foot.
- ехать / едем = to go by car, bus, train, etc.
- идти / идём = to go on foot
So мы едем suggests that the speakers are traveling to the farm by some vehicle. If they were walking, you would normally say Сегодня мы идём на ферму за город.
Formally, едем is present tense. However, in Russian, the present tense of an imperfective verb is often used for a planned near-future action, especially when there is a time word like сегодня.
So here Сегодня мы едем... means something like:
- we’re going today
- we are going today
- today we’re heading out
This is very natural in Russian, just like English can say We’re going today.