As the current situation with COVID-19 doesn't seem to end in the near future and this might change many aspects of our life permenantly, I'm wondering how companies arrange new hires upon offers accepted these days?

Many big tech companies already indicated to work from home for the rest of 2020, and Twitter even announced to have optionally working remotely "forever".

If you got an offer (as SDE) recently, do employers still set a timeline for start date or just work from home by default?