Britney Spears and Kevin Federline are close to finalizing a custody arrangement allowing them both time to spend with their sons during Spears's tour.

Federline's lawyer Mark Vincent Kaplan tells E! News that an agreement can be reached in "probably the next day." Spears already has said sons Preston, 3, and Jayden, 2, would be joining her on the road when her two-month Circus tour kicks off on March 3 in New Orleans.

So how will visitation work on the road?

Spears will probably see her boys on "pretty much the same schedule that she has now," Kaplan tells E!. (Federline, 30, has primary custody of the boys, but Spears, 27, has nearly 50-50 access to them in visitation rights.)

"Kevin is working to make them accessible by going on various central locations in various areas of the country," says Kaplan. "He is doing that because he wants her to be able to have the maximum positive environment around her to assure that the tour will be successful."

Kaplan adds: "I don't think the kids will be at venues. They will be available in her life when she is done with the rigors of performing."

As for whether Federline's girlfriend, Victoria Prince, a onetime professional volleyball player, will be traveling with her beau, "I don’t even know if they know yet," Kaplan tells E!, adding that Prince, 26, "is a very solid person, and they are really great together. She is very solid, responsible, and has a very positive effect."

A lawyer for Spears wasn't immediately available for comment.