Reading from a script is not a common practice, but should be completely OK for an early-career (and even more experienced) researcher if it helps them, not only to memorise what they wants to say, but more important, to give a good presentation to the audience.
This technique could be very useful for people who have little or no presentation experience, have some fear of public speaking, or are not so articulate in the presentation language (e.g., not their native language).
The "speaker's notes" feature in many presentation tools (e.g., Powerpoint) is there to be used by the speaker (if needed). For each slides, you can put either the key points to remember or the whole script. For the latter, try to make a structured (e.g., bullet points) 2:45-minute script, and highlight the key points in bold/colors -- could be easier for you to memorize and follow, then practice the script and improve it as needed.
But in order to give a smooth presentation experience for the audience, you still need to take care of the other aspects of your presentation skills (e.g., good slides, body language, eye contact, effective pointing at figures/tables on the slides while reading from notes, etc).