Yes, from 04:30 until Open, and Close until 20:00 (EST), WeBull allows buying and selling shares. You can also place orders for options contacts from 08:00 until market close, but those PM orders won't fill until 09:30 at Market Open (provided they were going to fill immediately considering your limit settings).
When I deposit from my bank account, it takes 4-5 days until the "incoming deposit" notif goes away. When I have bought everything up to the limit of my liquid funds, I have zero buying power remaining. When I sell shares, those funds move from the 'market value' side, to the 'cash' side, but there funds aren't available to trade with again until the following day.
I have a cash account instead of a margin account, to get in less trouble with getting in and out of trades more swiftly. Hope this helps.