Although the Lord is being patient and wants people to repent, he will indeed return and bring judgment.
the day of the Lord will come as a thief
Peter speaks of the day when God will judge everyone as if it were a thief who will unexpectedly and take people by surprise. (See: rc://en/ta/man/translate/figs-personification and rc://en/ta/man/translate/figs-simile)
The heavens will pass away
"The heavens will disappear"
The elements will be burned with fire
This can be stated in active form. AT: "God will burn the elements with fire" (See: rc://en/ta/man/translate/figs-activepassive)
Possible meanings are 1) the heavenly bodies, such as the sun, moon, and stars or 2) the things that make up heaven and earth, such as soil, air, fire, and water.
the earth and the deeds in it will be revealed
God will see all the earth and all the deeds of everyone, and he will then judge everything. This can be stated in active terms. AT: "God will expose the earth and everything that people have done on it" (See: rc://en/ta/man/translate/figs-activepassive)