Patrick Schwarzenegger 'Can't Wait to Be the Best Uncle' to Katherine and Chris Pratt's Baby

New Mom Katherine Schwarzenegger Finds It 'Comforting' Husband Chris Pratt Is Already a Dad

For more about Chris and Katherine Schwarzenegger Pratt's life at home with their new baby, pick up the latest issue of PEOPLE, on newsstands Friday

Patrick Schwarzenegger is excited to dote on his new niece.

The 27-year-old actor appeared on the Today show Tuesday morning, opening up to Hoda Kotb and Savannah Guthrie about his new film Echo Boomers and what life has been like as of late for sister Katherine Schwarzenegger, her husband Chris Pratt and their 3-month-old daughter Lyla Maria.

"It's been really tough with COVID. Chris has been out filming the new Jurassic Park over in London so it's been kind of tough for Katherine with coming over and seeing us kids," said Patrick. "But we get tested every time before we see [Lyla]."

"It still feels like it hasn't hit that she has a baby," he added. "It's been really crazy. But she's a really beautiful girl and I can't wait to be the best uncle."

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Allen Berezovsky/WireImage Patrick and Katherine Schwarzenegger in 2018

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Pratt, 41, and Katherine, 30, confirmed the arrival of their baby girl on Aug. 10, sharing a photo of them holding hands with their new addition on Instagram.

"We are beyond thrilled to announce the birth of our daughter Lyla Maria Schwarzenegger Pratt," Pratt wrote in his announcement. "Both mom and baby are doing great. We feel extremely blessed! Love, Katherine and Chris."

"Everyone is doing well," a source told PEOPLE two days later. "They haven't left their house since they returned home from the hospital. They just want to bond with the baby and get to know her."

"They have some help and [Katherine's mom Maria Shriver] also makes sure they have everything they need. Lyla is adorable," the insider added.

Michael Buckner/Variety/Shutterstock Katherine Schwarzenegger and Chris Pratt

RELATED VIDEO: Chris Pratt and Katherine Schwarzenegger Introduce Daughter Lyla Maria: "Couldn't Be Happier"

Chris Pratt and Katherine Schwarzenegger Introduce Daughter Lyla Maria: 'Couldn't Be Happier'

"We are beyond thrilled to announce the birth of our daughter," Chris and Katherine Schwarzenegger Pratt announced on Monday

"And Kat has the best attitude," the source said. "She is obviously still tired, but she loves being a mom. She is so positive and excited about the whole experience. She loves seeing Chris with their girl. He is such a good dad."

"This was one of the things that Kat was attracted to from the beginning: Chris loves being a dad. Kat feels very lucky that Lyla gets to grow up with Chris as a dad," the insider continued. (Pratt also shares son Jack, 8, with ex-wife Anna Faris.)

A source previously told PEOPLE that the couple "knew they were having a girl and were thrilled about it."

"Kat had a good pregnancy, and she is hoping for a quick recovery — so far, so good," the insider added. "She is going through all the first-time-mom emotions. She is extremely happy but a bit tired and overwhelmed."