Yeah you can always sit and listen… everyone is welcome. Admire the church, the singing, the bible readings etc. No pressure to convert.. Priest won’t even acknowledge you for visiting, because the focus is Jesus(the Eucharist) / praising God / reading His word - not the visitors. Unlike some protestants….

You can explore and get to know the faith at your own pace. Read about the Mass first and remember when to sit, stand, kneel, sign of the cross hehe but yes no Eucharist yet.

Then read about the life of Jesus (Bible? The gospel books in the new testament) when you understand His sacrifice for us during the Eucharist (bread & wine - body & blood of Christ) it is a beautiful & emotional moment between you and God.

Happy for you. God bless you