Training/Taper/Meet Prep

I am 54 years old, and have recently gotten back into competitive swimming. I have not yet worked up to monster workouts (like folks doing 4000 yards) and not sure I would even want to. My shoulders can't take swimming every day. I have a meet on Saturday. I am only swimming two 50s (*** and free). My training for the last week or so was as follows: Thursday, 3/4 mile swim Friday, rest Saturday, worked with trainer (dry training/weights, etc.) Sunday-Monday-Tuesday (1200 yds, 1200 yds, 880 yards) Wednesday-rest Thursday (today)-1000 yards Should I work out at all on Friday. If so...how hard? What is the best prep for the day of the meet (in terms of rest, supplements, eating, etc.). The meet is not until 4 pm. Thanks in advance to anyone who can help.