Mayor Bill de Blasio heralded the arrival of the USNS Comfort hospital ship off Manhattan on Monday as a much-needed morale boost amid the coronavirus crisis.

“We’ve all been through a lot these last few weeks,” said de Blasio, standing on the West Side’s Pier 90, where the 1,000-bed vessel docked Monday morning.

“We needed this boost, we needed this hope that’s being created by our brothers and sisters in the US Navy,” he said. “This ship arriving is not just an example of help arriving in a physical form, it’s not just about the beds and the doctors and the equipment.

“It’s also about hope.”

The Comfort, dispatched by President Trump out of Norfolk, Virginia, on Saturday, will be used to treat non-coronavirus patients, easing the strain on city hospitals already overtaxed in the face of the contagion.

“Our nation is helping us in our hour of need,” said de Blasio. “This is a wartime atmosphere. … We may have differences in peacetime, but to the maximum extent possible, we all have to be as one.”

Hizzoner specifically thanked Trump, a high point in their on-again, off-again relationship amid the contagion.

“It’s also about boosting the morale of New Yorkers,” he said. “Our nation has heard our plea for help, here in New York City.”

Of the vessel’s 1,000 beds, 750 will be available to receive patients as early as Tuesday.

Thomas Von Essen — who served as FDNY commissioner under Mayor Rudy Giuliani on 9/11, and is now regional director for the Federal Emergency Management Agency — used one crisis to provide a rough timeline for another.

“September 11, it seemed like every day we were fixing stuff and it was getting slightly better every day,” he said, speaking alongside de Blasio. “With this, we’re not there yet.

“It might not get better here in the city for weeks, maybe a month.”