Thunderstorms hit when there is enough instability in the atmosphere. Matters where in florida you live and which way the winds are blowing. For example a east wind across the state would mean the west coast should recieve the storms due to their sea-breeze colliding with the east wind by noon but some areas might not get it till later in the afternoon. Also vice versa. Also some days a upper level low or trough might be in the area causing the storms to pop up almost anytime during the daytime hours.
Overall its how much moisture is in the atmosphere,daytime heating and wind direction that will determine where and when storms arrive. Florida during the summer is hit-miss so you may not get hit till 5 but others might get hit hours before or after even. There is no change to this since recordings started in the late 1800s.