Is united operating the same pre-COVID schedule -- hardly
Domestically bookings are recovering but flights are on different routes. Business routes are still down, leisure routes are >100%
Internationally -- still below 50%

As for the fleet, planes are still parked and some may never return
The MAXs are returning, the 772 PWs are still unknown return date
Some aircraft have been retired, so in the short term post COVID, capacity will be reduced as most carriers are doing
For parked / retired UA status see - https://sites.google.com/site/united...arked-aircraft
and

Be careful with the AA announcement, many aircraft were retired vs parked.
Such as American Airlines Retires 22 Boeing 737s And Changes Its Paint
and
So, AA may have unparked all of its unretired aircraft but that does not mean AA is returning to pre-COVID levels of operation