You can use the TraceTogether Token to check in to SE at premises equipped with QR code scanners. The list of major public places accepting Tokens is available at https://go.gov.sg/token-venues (list is non-exhaustive) and will be updated over time. You may also check directly with individual premises if they are able to scan Tokens for SE check-in.
For premises without QR code scanners, you can continue to check-in either by scanning the SE QR code using your phone, or by presenting your NRIC.