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 / Updated  / Source: TODAY
By Chris Serico

For a band that had to postpone a weeklong residency on "The Tonight Show Starring Jimmy Fallon," U2 certainly appears to be making up for lost time.

U2 performs on "The Tonight Show" on February 17, 2014.NBC

After a memorable rooftop performance for Fallon's "Tonight Show" hosting debut, U2 planned to return for an extended residency in November. But when lead singer Bono was seriously injured in a bike accident and endured hours of surgery, those plans were put on hold.

Fast-forward to this week, when a healthier Bono and his band — now slotted to be the sole guests for this Friday's show — popped up all over New York City.

And, as it turns out, Fallon's been spotted with them.

On Monday night, the band emerged unannounced at a subway stop beneath Grand Central Terminal to perform "Angel of Harlem." Flocks of fans gathered to sing along and document the moment on social media.

And, in a likely homage to the accident that prompted the "Tonight Show" delay, Bono and Fallon took a bike ride outside of 30 Rock.

Bono and Jimmy Fallon seen riding their bikes on sidewalk while filming a set for 'The Tonight Show Starring Jimmy Fallon' in New York City on Sunday May 3, 2015.Splash News

"The Tonight Show" featuring U2 is scheduled to premiere at 11:35 p.m. Friday.

Follow TODAY.com writer Chris Serico on Twitter.