Yes. If you're sure of the day you stopped playing and time travel back to it, the game will believe it to be the exact same day. Same stuff in the stores, same things sold out if you bought them, same flowers watered, etc. As someone who often takes breaks from Animal Crossing games for indeterminate amounts of time, I tend to keep a log of the last day and time played so I can always travel back and not have to deal with weeds or, in older games, villagers moving out without asking. Just be sure to turn off the Synchronize option for the Switch's clock. System Settings -> System -> Date and Time -> Synchronize Clock via Internet (Off).