The Dev said that the Leslie fuck is planned around v0.10, we are in v0.6.5, since 2022 we had an average of 2 updates for year (3 in 2022, 1 in 2023, 2 in 2024), the way the game is being released since 2023 is with an specific girl update (in the v0.x.0s) and a family update (in the v0.x.5s) (but Leslie gets content every update). If we expect this rate to continue (which idk how realistic it is), then we will have (aprox) v0.7 and v0.7.5 in 2025, v0.8 and v0.8.5 in 2026, v0.9 and v0.9.5 in 2027, and finally v0.10 and v0.10.5 in 2028.
If the rate of updates improves, to lets say an average of 3 per year: v0.7, v0.7.5 and v0.8 in 2025; v0.8.5, v0.9 and v0.9.5 in 2026, and v0.10/v0.10.5 in 2027
If the rate gets worse...
this is just a long way to say: Don't expect it soon