Hello,
Yes the @filename would include the temporal offsets for each slice as you describe. The safest option is to get the timing directly from the scanner protocol - although I'm not sure how to export it from a Philips; your technologist or physicist might be able to assist there.
If you use dcm2nii_afni (or the usual dcm2nii) then it should create a JSON (BIDS sidecar) file that has the slice timing information in it.
-Peter