From 15th April 2022, fully vaccinated Singapore residents and long-term pass holders arriving via the land checkpoints will no longer need to submit the health declaration via the SG Arrival Card.
Refer to the following for more details:
https://www.ica.gov.sg/news-and-publications/newsroom/media-release/health-declaration-no-longer-required-for-vaccinated-singapore-residents-and-long-term-pass-holders-using-the-land-checkpoints