On halving, we should expect the miners' reward to be reduced by a half. That's what this event is about. We can also expect more media attention on Bitcoin than usual, maybe a few articles about halving. There's no direct correlation between halvings and bull markets because counting whatever happens over the next 1 year or so and attributing that to halving is stretching it. During 2016 halving, the price stayed roughly the same as pre-halving, and the bull market properly hit only at the end of 2017. The 2020 halving was also largely uneventful, with the price really starting to grow in October of the same year. So this time, it will probably also be pretty uneventful.
I don't think it is ok or advisable to invest in it yet if you don't want to loose money or your capital because since Bitcoin has no underlying value but only have a cost to produce
its value by entirely subjecting to demands and dynamics
and only tends to have a positive impact only if further restrictions are made to the supply. So it is advisable to stay put until an assurance is being giving base on it.