Hello
@wakecarter has a self-paced reading example in PsychoPy Online Demos. You might to use this as a start for a word by word display with saving RT for each word.
The attached example is a simplified self-paced reading experiment.
SelfPacedShortVersion.psyexp (33.4 KB)
warmUp.xlsx (8.0 KB)
Both sources might give you some ideas how to implement a self-paced reading experiment.
You define trial as a column in your Excel-file and as routine. Avoid this, use unique names.
Best wishes Jens