How to filter Date field when querying SharePoint List

Business scenario is to select the list items which are satisfying the following criteria:

StartDate >= Today <= EndDate

The simple working code using PNP JS is as below:

let web = new Web(this.props.adminSiteURL);
      let alerts: Alerts[] = await web.lists.getByTitle('Alerts').items
        .filter(`StartDate le ` + new Date().toISOString() + `or StartDate eq ` + new Date().toISOString()
          + `OData__EndDate ge ` + new Date().toISOString() + `or OData__EndDate eq ` + new Date().toISOString()).get();
      return alerts;