RBR seems to have the advantage, in the hands of Max at least, when you compare the tyres that were on the cars when the best laps were set on Day 3.
Ferrari's hero time came on the softest compound C5 and the other ahead of Max on the timing board, see below, were on C4s a step softer than the C3s Max was on. Ironically neither C4 or C5 will be available for the Bahrain race itself, so one can only surmise they were used for publicity, or perhaps confirmation of car behaviour if & when they can be used in a race.
Can we trust these times to give the whole picture of pecking order though? Many a slip between Testing & real race conditions.
Bahrain F1 Testing Day Three - final timesheet(all times unofficial)
1. Charles Leclerc (Ferrari) - 1:30.322, 74 laps C5
2. George Russell (Mercedes) - +0.046, 67 laps C4
3. Zhou Guanyu (Kick Sauber) - +0.325, 85 laps C4
4. Max Verstappen (Red Bull) - +0.433, 66 laps C3
5. Yuki Tsunoda (RB) - +0.453, 53 laps C4
6. Alex Albon (Williams) - +0.662, 121 laps C4
7. Oscar Piastri (McLaren) - +0.708, 91 laps C3
8. Fernando Alonso (Aston Martin) - +0.837, 75 laps C3
9. Carlos Sainz (Ferrari) - +0.925, 71 laps C3
10. Sergio Perez (Red Bull) - +1.161, 53 laps C3
11. Nico Hulkenberg (Haas) - +1.364, 89 laps C3
12. Lewis Hamilton (Mercedes) - +1.677 49 laps C3
13. Lance Stroll (Aston Martin) - +1.716, 46 laps C3
14. Lando Norris (McLaren) - +1.786, 20 laps C3
15. Pierre Gasly (Alpine) - +1.827, 47 laps C3
16. Kevin Magnussen (Haas) - +2.731, 80 laps C3
17. Esteban Ocon (Alpine) - +2.757, 55 laps C3
18. Valtteri Bottas (Kick Sauber) - +3.206, 28 laps C3
19. Daniel Ricciardo (RB) - +6.693, 70 laps C1