The short answer is no. The longer answer is that you can see the planned type of aircraft when you book your ticket which doesn't typically change. But airlines can and do sometimes switch aircraft types at the last minute up to the point where you're already at the gate.
ADDED: And I'm guessing things are more fluid than usual in the current situation.
It really depends on the route (and the airline). Some routes I've flown are scheduled for different types throughout the day; it's not uncommon to fly on the other type. As a bonus, different types have different premium rows, if you reserve a non-premium seat and the type is changed, you may keep the seat number and get a premium seat.
ADDED: And I'm guessing things are more fluid than usual in the current situation.